M2 Browning

Browning Machine Gun, Cal. .50, M2, HB
M2HB heavy machine gun
Type	Heavy machine gun
Place of origin	United States
Service history
In service	1933–present
Used by	See Users
Wars	World War II Korean War First Indochina War Suez Crisis Portuguese Colonial War Vietnam War Six-Day War Iran-Iraq war Yom Kippur War Cambodian Civil War Cambodian-Vietnamese War Falklands War South African Border War Namibian War of Independence Invasion of Grenada Bougainville Civil War[1] Invasion of Panama Persian Gulf War Somali Civil War Yugoslav Wars War in Afghanistan Iraq War Mexican Drug War
Production history
Designed	1918[2]
Manufacturer	Current: General Dynamics, Fabrique Nationale, U.S. Ordnance, and Manroy Engineering (UK) Former: Sabre Defence Industries, Colt's Patent Fire Arms Company, High Standard Company, Savage Arms Corporation, Buffalo Arms Corporation, General Motors Corporation (Frigidaire, AC Spark Plug, Saginaw Steering, and Brown-Lipe-Chappin Divisions), Kelsey Hayes Wheel Company, Springfield Armory, Wayne Pump Company, ERMCO, and Ramo Manufacturing, Rock Island Arsenal
Produced	1921 – present (M2HB)
Number built	3 million[3]
Specifications
Weight	38 kg (83.78 lb) 58 kg (127.87 lb) with tripod and T&E
Length	1,654 mm (65.1 in)
Barrel length	1,143 mm (45.0 in)
Cartridge	.50 BMG (12.7×99mm NATO)
Action	Short recoil-operated
Rate of fire	450-600 rounds/min (M2HB)[4][5] 750–850 rounds/min (AN/M2) 1,200 rounds/min (AN/M3)
Muzzle velocity	2,910 ft/s (890 m/s) for M33 ball
Effective firing range	1,800 m (2,000 yd)[4]
Maximum firing range	6,800 m (7,400 yd)
Feed system	Belt-fed (M2 or M9 links)

The M2 Machine Gun or Browning .50 Caliber Machine Gun is a heavy machine gun designed towards the end of World War I by John Browning. Its design is similar to Browning's earlier M1919 Browning machine gun, which was chambered for the .30-06 cartridge. The M2 uses the much larger and much more powerful .50 BMG cartridge, which was developed alongside and takes its name from the gun itself (BMG standing for Browning Machine Gun). It has been referred to as "Ma Deuce",^[6] in reference to its M2 nomenclature. The design has had many specific designations; the official designation for the current infantry type is Browning Machine Gun, Cal. .50, M2, HB, Flexible. It is effective against infantry, unarmored or lightly armored vehicles and boats, light fortifications and low-flying aircraft. The M2 machine gun has been produced longer than any other machine gun.

The Browning .50 caliber machine gun has been used extensively as a vehicle weapon and for aircraft armament by the United States from the 1930s to the present. It was heavily used during World War II, the Korean War, the Vietnam War, the Falklands War, the Iraq War and the War in Afghanistan in the 2000s and 2010s. It is the primary heavy machine gun of NATO countries, and has been used by many other countries. The M2 has been in use longer than any other small arm in U.S. inventory except the .45 ACP M1911 pistol, also designed by John Browning.

The current M2HB is manufactured in the U.S. by General Dynamics^[7] and U.S. Ordnance^[8] for use by the U.S. government, and for allies via Foreign Military Sales.

History

Machine guns were heavily used in World War I, and weapons of larger than rifle caliber were appearing. Both the British and French had large caliber machine guns. The larger rounds were needed to defeat the armor that was being introduced to the battlefield. Armor was also appearing in the skies. During World War I, the Germans introduced a heavily armored airplane, the Junkers J.I. The armor made aircraft machine guns using conventional rifle ammunition (such as the .30-06) ineffective.^[9]

Consequently, the American Expeditionary Force's commander General John J. Pershing asked for a larger caliber machine gun.^[10] Pershing asked the Army Ordnance Department to develop a machine gun with a caliber of at least 0.50 inches (12.7 mm) and a muzzle velocity of at least 2,700 feet per second (820 m/s).^[9] U.S. Col. John Henry Parker, commanding a machine gun school in France, observed the effectiveness of a French 11 mm (0.43 in) incendiary armor-piercing round. The Army Ordnance Department ordered eight experimental Colt machine guns rechambered for the French 11-mm cartridge.^[11] The French had developed a prototype machine gun for an even larger caliber.

The French 11-mm round was found to be unsuitable because its velocity was too low. Pershing wanted a bullet of at least 670 gr (43 g) and a muzzle velocity of 2,700 ft/s (820 m/s). Development with the French round was dropped.^[11]

Around July 1917, John M. Browning started redesigning his .30 caliber machine gun for a larger caliber. Winchester worked on the cartridge, which was a scaled-up version of the .30-06. Winchester initially added a rim to the cartridge because the company wanted to use the cartridge in an anti-tank rifle, but Pershing insisted the cartridge be rimless.^[11] The first .50 machine gun underwent trials on 15 October 1918. It fired at less than 500 rounds per minute, and the muzzle velocity was only 2,300 ft/s (700 m/s). Cartridge improvements were promised.^[12] The gun was heavy, difficult to control, fired too slowly for anti-personnel, and was not powerful enough against armor.^[13]

While the .50 was being developed, some German anti-tank rifles and ammunition were seized. The German rounds had a muzzle velocity of 2,700 ft/s (820 m/s), an 800 gr (52 g) bullet, and could pierce 1 in (25 mm) at 250 yd (230 m).^[14] Winchester made the .50 caliber round have similar performance. Ultimately, the muzzle velocity was 2,750 ft/s (840 m/s).^[15]

Efforts by John M. Browning and Fred T. Moore resulted in the water-cooled Browning machine gun, caliber .50, M1921. An aircraft version was termed the Browning aircraft machine gun, caliber .50, M1921. These guns were used experimentally from 1921 until 1937. They had light-weight barrels and the ammunition fed only from the left side. Service trials raised doubts whether the guns would be suitable for aircraft or for anti-aircraft use. A heavy barrel M1921 was considered for ground vehicles.^[16]

John M. Browning died in 1926. Between 1927 and 1932, Dr. S.H. Green studied the design problems of the M1921 and the needs of the armed services. The result was a single receiver design that could be turned into seven types of .50 caliber machine guns by using different jackets, barrels, and other components. The new receiver allowed right or left hand feed. In 1933, Colt manufactured several prototype Browning machine guns (including what would be known as the M1921A1 and M1921E2). With support from the Navy, Colt started manufacturing the M2 in 1933.^[17] FN Herstal (Fabrique Nationale) has manufactured the M2 machine gun since the 1930s.^[18] General Dynamics, U.S. Ordnance, and Manroy Engineering (UK) are other current manufacturers.

A variant without a water jacket, but with a thicker-walled, air-cooled barrel was designated the M2 HB (HB for Heavy Barrel). The added mass and surface area of the heavy barrel compensated somewhat for the loss of water-cooling, while reducing bulk and weight: the M2 weighs 121 lb (55 kg) with a water jacket, but the M2 HB weighs 84 lb (38 kg). Due to the long procedure for changing the barrel, an improved system was developed called QCB (quick change barrel). The lightweight "Army/Navy" prefixed AN/M2 "light-barrel" version of the Browning M2 weighing 60 pounds (27 kg) was also developed, and became the standard .50-caliber aviation machine gun of the World War II-era for American military aircraft of nearly every type,^[19] readily replacing Browning's own air-cooled .30 caliber machine gun design in nearly all American aircraft installations.

Design details

The Browning M2 is an air-cooled, belt-fed machine gun. The M2 fires from a closed bolt, operated on the short recoil principle. The M2 fires the .50 BMG cartridge, which offers long range, accuracy and immense stopping power. The closed bolt firing cycle made the M2 usable as a synchronized machine gun on aircraft before and during World War II, as on the early versions of the Curtiss P-40 fighter.

The M2 is a scaled-up version of John Browning's M1917 .30 caliber machine gun, even using the same timing gauges.

Features

The M2 has varying cyclic rates of fire, depending on the model. The M2HB (heavy barrel) air-cooled ground gun has a cyclical rate of 450-575 rounds per minute.^[20] The early M2 water-cooled AA guns had a cyclical rate of around 450–600 rpm.^[21] The AN/M2 aircraft gun has a cyclic rate of 750–850 rpm; this increases to 1,200 rpm or more for AN/M3 aircraft guns fitted with electric or mechanical feed boost mechanisms.^[5] These maximum rates of fire are generally not achieved in use, as sustained fire at that rate will wear out the bore within a few thousand rounds, necessitating replacement. In addition to full automatic, the M2HB can be selected to fire single-shots or at less than 40 rounds per minute, or rapid fire for more than 40 rounds per minute. Slow and rapid firing modes use 5-7 round bursts with different lengths of pause between bursts.^[22]

The M2 has an effective range of 1,830 metres (2,000 yd) and a maximum effective range of 2,000 metres (2,200 yd) when fired from the M3 tripod. In its ground-portable, crew-served role as the M2HB, the gun itself weighs 84 pounds (38 kg) and the assembled M3 tripod another 44 pounds (20 kg). In this configuration, the V-shaped "butterfly" trigger is located at the very rear of the weapon with a "spade handle" hand-grip on either side of it and the bolt release in the center. The spade handles are gripped and the butterfly trigger is depressed with one or both thumbs. Recently, new rear buffer assemblies have used squeeze triggers mounted to the hand grips, doing away with the butterfly triggers.

When the bolt release is locked down by the bolt latch release lock on the buffer tube sleeve, the gun functions in fully automatic mode. Conversely, the bolt release can be unlocked into the up position resulting in single-shot firing (the gunner must press the bolt latch release to send the bolt forward). Unlike virtually all other modern machine guns, it has no safety (although a sliding safety switch has recently been fielded to USMC armorers for installation on their weapons and is standard-issue for the U.S. Army for all M2s). Troops in the field have been known to add an improvised safety measure against accidental firing by slipping an expended shell casing under the butterfly trigger.^[23] The upgraded M2A1 has a manual trigger block safety.

Because the M2 was intentionally designed to operate in many configurations, it can be adapted to feed from the left or right side of the weapon by exchanging the belt-holding pawls, and the front and rear cartridge stops (three-piece set to include link stripper), then reversing the bolt switch. The operator must also convert the top-cover belt feed slide assembly from left to right hand feed as well as the spring and plunger in the feed arm. This will take a well trained individual less than two minutes to perform.

The charging assembly may be changed from left to right hand charge. A right hand charging handle spring, lock wire and a little know how are all that are required to accomplish this. The M2 can be battle ready and easily interchanged if it is preemptively fitted with a retracting slide assembly on both sides of the weapon system. This eliminates the need to have the weapon removed from service to accomplish this task.

Ammunition

There are several different types of ammunition used in the M2HB and AN aircraft guns. From World War II through the Vietnam War, the big Browning was used with standard ball, armor-piercing (AP), armor-piercing incendiary (API), and armor-piercing incendiary tracer (APIT) rounds. All .50 ammunition designated "armor-piercing" was required to completely perforate 0.875 inches (22.2 mm) of hardened steel armor plate at a distance of 100 yards (91 m) and 0.75 inches (19 mm) at 547 yards (500 m).^[24] The API and APIT rounds left a flash, report, and smoke on contact, useful in detecting strikes on enemy targets; they were primarily intended to incapacitate thin-skinned and lightly armored vehicles and aircraft, while igniting their fuel tanks.^[25]

Current ammunition types include M33 Ball (706.7 grain) for personnel and light material targets, M17 tracer, M8 API (622.5 grain), M20 API-T (619 grain), and M962 SLAP-T. The latter ammunition along with the M903 SLAP (Saboted Light Armor Penetrator) round can perforate 1.34 inches (34 mm) of HHA (face-hardened steel plate) at 500 metres (550 yd), 0.91 inches (23 mm) at 1,200 metres (1,300 yd), and 0.75 inches (19 mm) at 1,500 metres (1,600 yd). This is achieved by using a 0.30-inch-diameter (7.6 mm) tungsten penetrator. The SLAP-T adds a tracer charge to the base of the ammunition. This ammunition was type classified in 1993.^[26][27]

When firing blanks, a large blank-firing adapter (BFA) of a special type must be used to allow the recoil operated action to cycle. This functions on the principle of a recoil booster, to increase the recoil force acting on the short recoil action. This is the exact antithesis of a muzzle brake. Without this adaptor, the reduced-charge blank cartridge would develop too little recoil to cycle the action fully. The adapter is very distinctive, attaching to the muzzle with three rods extending back to the base. The BFA can often be seen on M2s during peacetime operations.

Deployment

The M2 .50 Browning machine gun has been used for various roles:

• A medium infantry support weapon
• As an light anti-aircraft (AA) gun in some ships; up to six M2 guns could be mounted on the same turret.
• As an anti-aircraft gun on the ground. The original water-cooled version of the M2 was used on a tall AA tripod or vehicle-mounted anti-aircraft weapon on a sturdy pedestal mount. In later variants, twin and quadruple M2HB Brownings were used, such as the M45 Quadmount used on the US M16 half-track carrier. Twin or quad-mount .50 M2 guns normally used alternating left-hand and right-hand feed.
• Primary or secondary weapon on an armored fighting vehicle.
• Primary or secondary weapon on a naval patrol boat.
• Spotting for the primary weapon on some armored fighting vehicles.
• Secondary weapon for anti-boat defense on large naval vessels (corvettes, frigates, destroyers, cruisers, etc.).
• Coaxial gun or independent mounting in some tanks.
• Fixed-mounted forward-firing primary aircraft armament (AN/M2 and AN/M3 light-barrel versions only). The AN/M2 was used as primary armament in almost all World War II U.S. pursuit aircraft (such as the P-51 Mustang, P-47 Thunderbolt, P-38 Lightning, P-39 Airacobra, P-40 Tomahawk, F6F Hellcat and F4U Corsair). It was also used in fixed mountings in bombers and ground attack aircraft like the SBD Dauntless dive bomber, TBF Avenger torpedo bomber, and medium bombers such as B-25 Mitchell, B-26 Marauder and A-26 Invader. The later, faster-firing electrically feed-boosted AN/M3 was used in many Korean War-era U.S.A.F. fighter aircraft such as the F-80 Shooting Star, F-84 Thunderjet, F-86 Sabre, and early versions of the B-57 Canberra bomber. The US Navy had largely completed their move to the (unrelated) M2/AN 20mm autocannon for aircraft armament by this time.
• Turret-mount or flexible-mounted defensive armament, again only with the AN/M2 light-barrel version, in almost all US World War II-era bombers and patrol aircraft such as the B-17 Flying Fortress, B-24 Liberator and B-29 Superfortress heavy bombers, B-25 Mitchell and B-26 Marauder medium bombers, PBY Catalina patrol flying boats, TBF/TBM Avenger torpedo bombers, and in a combined offensive/defensive turret mounting in many Northrop P-61 Black Widow night fighters. The AN/M3 was used as a flexible, quad-mounted, radar-directed tail-defence gun as late as 1980 on the B-52 Stratofortress, until replaced by 20mm M61 Vulcan Gatling type cannon
• Variants of the AN/M3 are used as flexible door guns or as flexible remotely-controlled armament subsystems on many US Army, Navy, Marine Corps and Coast Guard helicopters, such as the UH-1 Iroquois, UH-60 Blackhawk and variants, CH-53 Super Stallion, OH-58 Kiowa Warrior and others.

United States

At the outbreak of the Second World War the United States had versions of the M2 in service as fixed aircraft guns, anti-aircraft defensive guns (on aircraft, ships, or boats), infantry (tripod-mounted) guns, and as dual purpose anti-aircraft and anti-vehicular weapons on vehicles.^[28][29]

The .50 AN/M2 light-barrel aircraft Browning used in planes had a rate of fire of approximately 800 rounds per minute, and was used singly or in groups of up to eight guns for aircraft ranging from the P-47 Thunderbolt to the B-25 Mitchell bomber, which in the last J-version of the Mitchell could have up to fourteen M2s firing forward for ground attack missions - eight in a solid metal-structure nose, four more mounted in a pair of conformal twin-gunned gun pods on the lower cockpit sides, and two more if the forward dorsal turret's pair of M2 guns were also aimed straight forward.

In the dual-purpose vehicle mount, the M2HB (heavy barrel) proved extremely effective in U.S. service: the Browning's .50 caliber AP and API rounds could easily penetrate the engine block or fuel tanks of a German Bf 109 fighter attacking at low altitude,^[30] or perforate the hull plates and fuel tanks of a German half-track or light armored car.^[24][31][32] While the dual-purpose mounting was undeniably useful, it did normally require the operator to stand when using the M2 in a ground role, exposing him to return fire.^[33] Units in the field often modified the mountings on their vehicles, especially tanks and tank destroyers, to provide more operator protection in the anti-vehicular and anti-personnel role.^[34] The weapon was particularly hated by the Germans, whose attacks and ambushes against otherwise helpless stalled motor convoys were frequently broken up by .50 caliber machine gun fire.^[35][36] Vehicles would frequently "recon by fire" with the M2 Browning, i.e. they would fire continuously at suspected points of ambush while moving through areas still containing enemy forces. One vehicle would fire exclusively to the right, the following vehicle to the left, the next one to the right, and so on in order to cover both flanks of the advancing convoy.

Besides vehicle-mounted weapons, the heavy weapons companies in a World War II U.S. Army infantry battalion or regiment were each issued one M2 Browning with tripod (ground) mount.^[37] Mounted on a heavily sandbagged tripod, the M2HB proved very useful in either a defensive role or to interdict or block road intersections from use by German infantry and motorized forces.^[38] Hearing the sound of an M2 could often cause enemy infantry to take cover.^[39] There are numerous instances of the M2 Browning being used against enemy personnel, particularly infantry assaults^[40] or for interdiction or elimination of enemy artillery observers or snipers at distances too great for ordinary infantry weapons.^[41][42][43]

The M2HB was not widely used in the Pacific campaign for several reasons, including the weight of the gun, the nature of infantry jungle combat, and because road intersections were usually easily outflanked.^[44] However, it was used by fast-moving motorized forces in the Philippines to destroy Japanese blocking units on the advance to Manila.^[38] The quad mount .50 was also used to destroy Japanese emplacements.^[45]

The M2HB was used in Korea and Vietnam, and later in both Operation Desert Storm, the Afghan theater of Operation Enduring Freedom and in Iraq. In 2003, U.S. Army SFC Paul Ray Smith used his M2HB mounted on an M113 armored personnel carrier to kill 20 to 50 enemies who were attacking a U.S. outpost, preventing an aid station from being overrun and allowing wounded soldiers to be evacuated,^[46] SFC Smith was killed during the firefight and was posthumously awarded the Medal of Honor.

M45 Quadmount

The M45 Quadmount was a mounting of four .50 M2HB guns with a single gunner situated behind an armored housing. This was used by U.S. AA battalions, fitted either on a towed trailer or mounted in a half-track carrier (M16 AA half-track). With 200 rounds per gun in a powered tracking mount, the guns proved very effective against low-flying aircraft. The use of four guns adequately compensated for the fact that the individual M2HB's rate of fire (450-550 rounds per minute) was low for an effective anti–aircraft weapon.^[47]

Towards the end of the war, as Luftwaffe attacks became less frequent, the quad .50 (nicknamed the Meat Chopper or Krautmower^[47]) was increasingly used in an anti-personnel role, similarly to the earlier-introduced (1940) and more powerful German 20mm Flakvierling. Snipers firing from trees were engaged by the quad gunner at trunk level - the weapon would cut down and destroy the entire tree, and the sniper with it.^[39][45]

The M45 Quadmount was still in use during the Vietnam War.

Commonwealth and other forces

Commonwealth use of the M2 Browning .50 caliber machine gun (known as the .5 Browning in British and Commonwealth service) was limited in the Second World War, though from 1942 it was standard armament on US-built AFVs provided under lend-lease such as the M4 Sherman, M7 Priest, M8 Greyhound, or M10 Wolverine variously used by British, Canadian, Australian, South African and New Zealand units. Nevertheless, the heavy Browning's effectiveness was praised by many British and Commonwealth soldiers in infantry, armored, and ordnance branches.^[48][49] Many commanders thought that the .50 Browning the best weapon in its class, certainly the best of the American weapons, including the M1 Garand and carbine.^[49][50] In North Africa, after Commonwealth units began to obtain sufficient parts, manuals, gauges, and ammunition for the new weapon, the .50 Browning was increasingly used, eventually replacing the 15 mm Besa,^[49] but in Italy it was often deleted from top turret mountings because the mount exposed the operator to low branches and enemy fire.^[51] All LRDGs, and some SAS units used the aircraft (AN/M2) version of the gun, while beam/waist-mounted and turret-mounted Brownings were used later in the war in such aircraft as the Short Sunderland and Lancaster bomber.

After the Second World War, the .50 Browning continued to see action in Korea and other theaters, in aircraft, tripod (ground), ground AA (hip-ring), and vehicle mounts. One of its most notable actions in a ground role was in a fierce battle with a nine-man SAS team at the Battle of Mirbat in Oman in July 1972, where the heavy Browning and its API ammunition was used to help repulse an assault by 250 Yemeni Adoo guerrillas, though the more famous weapon from the battle is a 25 pounder gun.^[52]

A .50 caliber Browning was installed along with a .30 caliber Browning machine gun in each compact one-man turret on M113 APCs used by the Royal Australian Armoured Corps in South Vietnam.

Nigerian troops have extensively deployed the 50 caliber Browning, mounted on Otokar Cobra APCs, Panhard VBL M11s and Landcruiser gun-trucks in counterinsurgency operations in the Niger Delta, N.E Nigeria, the Jos Plateau and in Mali

M2 as a sniper rifle

The M2 machine gun has also been used as a long-range sniper rifle, when equipped with a telescopic sight. Soldiers during the Korean War used scoped M2s in the role of a sniper rifle, but the practice was most notably used by US Marine Corps sniper Carlos Hathcock during the Vietnam War. Using an Unertl telescopic sight and a mounting bracket of his own design, Hathcock could quickly convert the M2 into a sniper rifle, using the traversing-and-elevating (T&E) mechanism attached to the tripod. When firing semi-automatically, Hathcock hit man-size targets beyond 1,800 metres (2,000 yd)—twice the range of a standard-caliber sniper rifle of the time (a .30-06 Winchester Model 70). In fact, Hathcock set the record for the longest confirmed kill at 2,250 metres (2,460 yd), a record, which stood until 2002, when it was broken in Afghanistan by Canadian Forces sniper Arron Perry.^[53][54]

Variants and derivatives

M2 variants

The basic M2 was deployed in U.S. service in a number of subvariants, all with separate complete designations as per the US Army system. The basic designation as mentioned in the introduction is Browning Machine Gun, Cal. .50, M2, with others as described below.

The development of the M1921 water-cooled machine gun which led to the M2, meant that the initial M2s were, in fact, water-cooled. These weapons were designated Browning Machine Gun, Cal. .50, M2, Water-Cooled, Flexible. There was no fixed water-cooled version.

Improved air-cooled heavy barrel versions came in three subtypes. The basic infantry model, Browning Machine Gun, Cal. .50, M2, HB, Flexible, a fixed developed for use on the M6 Heavy Tank designated Browning Machine Gun, Cal. .50, M2, HB, Fixed, and a "turret type" whereby "Flexible" M2s were modified slightly for use in tank turrets. The subvariant designation Browning Machine Gun, Cal. .50, M2, HB, TT was only used for manufacturing, supply, and administration identification and separation from flexible M2s.

A number of additional subvariants were developed after the end of the Second World War. The Caliber .50 Machine Gun, Browning, M2, Heavy Barrel, M48 Turret Type was developed for the commander's cupola on the M48 Patton tank. The cupola mount on the M48A2 and M48A3 was thoroughly disliked by most tankers, as it proved unreliable in service.^[55] An externally mounted M2 was later adopted for the commander's position on the M1 Abrams tanks. Three subvariants were also developed for use by the U.S. Navy on a variety of ships and watercraft. These included the Caliber .50 Machine Gun, Browning, M2, Heavy Barrel, Soft Mount (Navy) and the Caliber .50 Machine Gun, Browning, M2, Heavy Barrel, Fixed Type (Navy). The fixed types fire from a solenoid trigger and come in left or right hand feed variants for use on the Mk 56 Mod 0 dual mount and other mounts.

M2A1

When the M2 was first being designed, John Browning faced two design challenges. With the machine tools available at that time, the dimensions that established the location of the bolt face and the depth of the chamber could not be held tightly enough to control the fit of the cartridge in the chamber. The round can be too tight in the chamber and the gun wouldn't shoot, or be too loose in the chamber resulting in a stoppage or ruptured cartridge. The other dimension that couldn’t be held close enough was when the firing pin would fall. The solution to these problems was adjustable timing and headspace; the operator had to screw the barrel into the barrel extension, moving the barrel toward the bolt face to reach the proper headspace with simple gages to allow the operator to adjust to the proper dimensions. By the late 20th century, the M2 was the only adjustable headspace weapon in the U.S. inventory. With rising reports of injuries from improperly headspaced weapons, the U.S. Military held a competition for a quick change barrel conversion kit with fixed timing and headspace in 1997. Three companies offered kits and Saco Defense won the competition. However, funding was lost before the design could be fully evaluated and the program ended. In 2007, the military found money to start a new competition. Saco Defense had since been acquired by General Dynamics, who won the competition.^[56]

On October 15, 2010, the M2A1 heavy machine gun was type classified by the U.S. Army. Formerly known as the M2E2, the M2A1 incorporates improvements to the design including a quick change barrel (QCB) with removable carrying handle, a new flash suppressor that reduces muzzle flash by 95 percent, fixed headspace and timing, a modified bolt, and a manual trigger block safety. "Headspace" is the distance between the face of the bolt and the base of the cartridge case, fully seated in the chamber. "Timing" is the adjustment of the gun so that firing takes place when the recoiling parts are in the correct position for firing. When a standard M2 had a barrel change, the headspace and timing had to be manually set. Improper adjustment could damage the weapon and cause serious injury to the user. Fixed headspace and timing reduces risk, and the carrying handle allows the barrel to be switched in seconds.^[57][58] In June 2011, the Army began conversion of M2HB machine guns to M2A1s.^[59] In February 2012, the Army announced that it will upgrade all 45,000 M2s to M2A1 standard.^[60] The M2A1 was named one of the greatest Army inventions of 2011.^[61] As of November 30, 2012, 8,300 built or converted M2A1s have been fielded by the U.S. Army.^[62] The U.S. Marine Corps plans to upgrade all of their ground-mounted M2s to M2A1 standard from 2016 to 2018.^[63]

Aircraft guns

AN/M2

The M2 machine gun was widely used during World War II and in later postwar conflicts as a remote or flexible aircraft gun. For fixed (offensive) or flexible (defensive) guns used in aircraft, a dedicated M2 version was developed called the .50 Browning AN/M2. The "AN" stands for "Army/Navy", since the gun was developed jointly for use by both services (unusual for the time, when the delineations between the Army and Navy were much stricter, and relations between armed services were often cool, if not outright hostile.) The AN/M2 had a cyclic rate of 750–850 rounds per minute, with the ability to be fired from an electrically operated remote-mount solenoid trigger when installed as a fixed gun. Cooled by the aircraft's slip-stream, the air-cooled AN/M2 was fitted with a substantially lighter 36-inch (91 cm) length barrel, reducing the weight of the complete unit to 61 pounds (28 kg),^[64] which also had the effect of increasing the rate of fire. The official designation for this weapon was Browning Machine Gun, Aircraft, Cal. .50, AN/M2 (Fixed) or (Flexible). The B-17G Flying Fortress heavy bomber was armed with up to 13 AN/M2 guns in both turreted and flexible positions, with only the later versions of the B-25J Mitchell medium bomber, field-fitted with solid metal noses carrying more AN/M2 guns. These could carry from 14 to 18 M2s, mostly aimed forward for attack duties, with the guns of the forward-located dorsal turret of the B-25H and J models being two of this number.

M296

The XM296/M296 is a further development of the AN/M2 machine gun for the OH-58 Kiowa Warrior helicopter. The M296 differs from previous remote firing variants in that it has adjustable firing rate (500–850 rpm), while lacking a bolt latch (allowing single-shot operation).^[65] As an air-cooled gun used aboard a relatively slow rotary-wing aircraft, the M296 has a burst restriction rate of 50 rounds per minute sustained fire or 150 rounds per minute maximum while conducting peacetime training requirements; the combat firing rate is unrestricted but a ten-minute cooling period after prolonged firing is mandated to avoid stoppages due to overheating.^[66]

XM213/M213, XM218, GAU-15/A, GAU-16/A, and GAU-18/A

The XM213/M213 was a modernization and adaptation of existing .50 caliber AN/M2s in inventory for use as a pintle mounted door gun on helicopters using the M59 armament subsystem.

The GAU-15/A, formerly identified as the XM218, is a lightweight member of the M2/M3 family. The GAU-16/A was an improved GAU-15/A with modified grip and sight assemblies for similar applications. Both of these weapons were used as a part of the A/A49E-11 armament subsystem (also known as the Defensive Armament System).

The GAU-18/A, is a lightweight variant of the M2/M3, and is used on the USAF's MH-53 Pave Low and HH-60 Pave Hawk helicopters. These weapons do not use the M2HB barrel, and are typically set up as left-hand feed, right-hand charging weapons, but on the HH-60 Pavehawks that use the EGMS (External Gun Mount System) the gun is isolated from the shooter by a recoil absorbing cradle and all weapons are set up as right hand charge but vary between left and right hand feed depending on what side of the aircraft it is on. A feed chute adapter is attached to the left or right hand feed pawl bracket allowing the weapon to receive ammunition through a feed chute system connected to externally mounted ammunition containers holding 600 rounds each.

AN/M3, GAU-21/A, and M3P

During World War II, a faster-firing Browning was developed for aircraft use. The AN/M3 features a mechanical or electrically boosted feed mechanism to increase the rate of fire to around 1,200 rounds per minute. The AN/M3 was used in Korea on the F-86 Sabre, F-84 Thunderjet and F-80 Shooting Star, and in Vietnam in the XM14/SUU-12/A gun pod. Today, it can be found on the Embraer EMB 314 Super Tucano.

The M3-series is used by the U.S. military in two versions; the M3M and M3P. The fixed, remote-firing version, the FN M3P, is employed on the Avenger Air Defense System, and is currently used on the OH-58D, augmenting the XM296 .50 cal. machine gun.^[67] The M3M flexible machine gun has been adopted by USN under the designation GAU-21/A for use on helicopters. The GAU-21/A is also being used by the U.S. Marine Corps to upgrade from the XM-218/GAU-16 .50 cal. machine gun for the CH-53E,^[68] on the UH-1Y Venom, and on the Canadian Forces' CH-146 Griffon via the INGRESS upgrade. The Air Force is looking to replace the GAU-18 on the HH-60G Pave Hawk with the GAU-21 because of its higher 1,100 rpm rate of fire, longer 10,000-round barrel life, and lower recoil through use of a soft mount.^[69]

Users

The M2 family has been widely used abroad, primarily in its basic infantry configuration. A brief listing of designations for M2 family weapons follows:

Country	NATO Member	Designation	Description
Argentina[70]	No	M2HB	12.7 × 99 mm Browning M2HB machine gun
Australia[70]	Global Partner	M2HB-QCB[71]
Austria[70]	No	üsMG M2
Bahamas[70]
Bahrain[72](p77)
Belgium[70]	Yes
Benin[70]	No
Bolivia[70]
Brazil[70]		Mtr .50 M2 HB "BROWNING"
Bulgaria[70]	Yes
Burkina Faso[70]	No
Bosnia[70]
Burundi[70]
Cameroon[70]
Canada[70]	Yes	FN M2HB-QCB, GAU-21
Chad[70]	No
Chile[70]
Colombia[70]
Cote d'Ivoire[70]
Croatia[70]	Yes
Democratic Republic of Congo[70]	No
Denmark[70]	Yes	M/50 TMG
		M/2001 TMG	12.7 × 99 mm FNH M2HB-QCB[73]
		?	12.7 × 99 mm FNH M3M machine gun[74]
Cyprus
Djibouti[70]	No		12.7 × 99 mm Browning M2HB machine gun
Dominican Republic[70]
Ecuador[70]
Egypt[70]
El Salvador[70]
Estonia[75]	Yes	Browning M2 sometimes as Raskekuulipilduja Browning M2	12.7 × 99 mm Browning M2HB. Usually mounted on vehicles, such as the Pasi XA-180 and XA-188, but the tripod version is also in use.
Ethiopia[70]	No		12.7 × 99 mm Browning M2HB machine gun
France[70]	Yes
Finland[76]	No	12,7 RSKK 2005	12.7 × 99 mm Browning M2HB machine gun in Protector remote weapon stations in Patria AMV APCs.[77]
Gabon[70]			12.7 × 99 mm Browning M2HB machine gun
Gambia[70]
Ghana[70]
Germany[78]	Yes	M3M, MG50
Greece[70]
Guatemala[70]	No
Honduras[70]
Hungary	Yes
India[70]	No
Indonesia[70]
Iran[70]
Ireland[70]		.5 Heavy Machine Gun (HMG)[79]
Israel[70]		מק"כ 0.5	12.7 × 99 mm M2HB-QCB, used by all ground forces (infantry, armored fighting vehicles and tanks) and naval forces
Italy[70]	Yes		12.7 × 99 mm Browning M2HB machine gun
Jamaica[70]	No
Japan[70]		12.7mm Heavy Machine Gun M2
Jordan[70]
Katanga
South Korea[70]		K6	12.7 × 99 mm Browning M2HB with additional modification; licensed by Yeohwa Shotgun
Kuwait[70]			12.7 × 99 mm Browning M2HB machine gun
Lebanon[70]
Liberia[70]
Libya	No
Latvia[80]	Yes	M2HB-QCB
Lithuania[81]
Luxembourg[70]		Mitrailleuse .50 M2 HB[82]
Madagascar[70]	No
Malaysia[70]
Mauritania[70]
Mexico[70]
Morocco[70]
Myanmar[70]
Namibia	No
Netherlands[70]	Yes
New Zealand[70]	No
Nicaragua[70]
Niger[70]
Nigeria[70]
Norway[70]	Yes	12,7 mitraljøse
Oman[70]	No
Pakistan[70]
Panama[70]
Paraguay[70]
Peru[70]
Philippines[70]
Portugal[70]	Yes
Qatar[70]	No
Romania[70]	Yes
Rwanda[70]	No
Saudi Arabia[70]
Senegal[70]
Serbia[70]
Singapore[70]
Somalia[70]
South Africa[70]		50 Browning
Soviet Union	No	M2 AA variant, Lend-Lease, 3100 pieces[83]
Spain[70][84]	Yes	M2HB-QCB, M3M
Sweden[85]	No	Kulspruta 88 (Ksp 88)
Switzerland[70]		MG 64
Taiwan[70]
Thailand[70]
Togo[70]
Tonga[70]
Tunisia[70]
Turkey[70]	Yes
Turkmenistan[86]	No
United Arab Emirates[70]
United Kingdom[70]	Yes	L2A1
		L6, L6A1	12.7 × 99 mm Browning M2HB machine gun; ranging gun for the L7 105 mm tank gun on the Centurion tank
		L11, L11A1	12.7 × 99 mm Browning M2HB machine gun; ranging gun
		L21A1	12.7 × 99 mm Browning M2HB machine gun; ranging gun for the 120 mm tank gun on the Chieftain tank
		L111A1[87]	12.7 × 99 mm M2QCB machine gun
		M3M[88]	12.7 × 99 mm Browning M2HB machine gun; Upgraded M2 for use on Commando Helicopter Force and other units as helicopter door guns.
United States[70]		Browning Caliber .50 M2, M2HB, XM218/GAU-16, GAU-21	12.7 × 99 mm Browning M2HB machine gun
Uruguay[70]	No		12.7 × 99 mm Browning M2HB machine gun
Venezuela[70]
Yemen[70]
Zimbabwe[70]

See also

• M85 machine gun, a vehicle-borne replacement for the M2 that proved unreliable and was removed from service
• FN BRG-15 extra-large caliber machine gun
• KPV heavy machine gun 14.5 mm caliber machine gun
• List of U.S. Army weapons by supply catalog designation
• MG 131 machine gun, World War II 13 mm German aircraft-mounted gun
• List of individual weapons of the U.S. Armed Forces
• List of crew-served weapons of the U.S. Armed Forces
• DShK, NSV & Kord 12.7 mm machine guns, Soviet/Russian equivalents.
• M45 Quadmount

References

Notes

Bibliography

External links

Wikimedia Commons has media related to Browning M2.

• Aircraft Gunnery_.50 cal.
• M2 .50 Caliber Machine Gun at Federation of American Scientists
• Browning M2HB & M2HQCB (USA)
• M2 .50 cal. Machine Gun at Olive-Drab.com
• Quad-50 M2 .50 cal. Machine Gun at Olive-Drab.com
• Browning M2 .50 Caliber Machine Gun at Gary's Olive Drab Page
• Browning M2 HB .50 Caliber Heavy Machine Gun, "Ambush in Mogadishu", Frontline, PBS
• Can you use the .50-caliber on human targets?, Stars & Stripes
• Video of Operation on YouTube
• U.S. Army FM 23-65 Browning Machine Gun Caliber .50 HB, M2
• Browning .50 Cal. M2 Aircraft dimensions

Records
Preceded by	Longest confirmed combat sniper-shot kill 1967–2002 1.42 mi (2,286 m) using .50 BMG by Carlos Hathcock	Succeeded by McMillan Tac-50

M1917 Browning machine gun derivatives M1917 M1919 M2 M73 Mk 19 Ckm wz.30 XM174

John Browning Semi-automatic pistols FN M1900 Colt M1900 Colt M1902 FN Model 1903 M1903 Pocket Hammer M1903 Pocket Hammerless FN M1905 M1908 Vest Pocket FN Model 1910 M1911 Colt Woodsman Baby Browning Hi-Power Rifles Winchester Model 1885 Winchester Model 1886 Winchester 1892 Winchester Model 1894 Winchester Model 1895 Remington Model 8 Remington Model 24 FN Trombone Shotguns Winchester Model 1887 Winchester Model 1897 Browning Auto-5/Remington Model 11 Remington Model 17 Stevens Model 520/620 Browning Superposed Ithaca 37 Machine guns Colt–Browning M1895 Browning M1917 Browning Automatic Rifle Browning M1919 M2 Machine Gun Cartridges .25 ACP .32 ACP .38 ACP .380 ACP 9mm Browning Long .45 ACP .50 BMG

FN Herstal firearms and cartridges Handguns Baby Browning Barracuda Five-seven FNP FNX FNS Forty-Nine Hi-Power HP-DA M1900 M1903 M1905 M1910 Rifles Semi-automatic and Select-fire CAL F2000/FS2000 FAL FNAR FNC M1949 PS90 SCAR-L/SCAR-H Bolt-action Ballista M1950 Model 30-11 PBR SPR TSR Shotguns P-12 SLP TPS SC 1 Submachine guns P90 Machine guns BRG-15 M2 MAG Minimi Mle 1930 Miscellaneous 5.56×45mm SS109 5.7×28mm EGLM FN 303 FN 303 P 15.5×106mm

U.S. infantry weapons of World War II and Korea Side arms M1911/M1911A1 pistol Colt Model 1903/1908 Pocket Hammerless High Standard HDM M1917 revolver Smith & Wesson "Victory" revolver Colt New Service Colt Official Police Rifles and carbines M1903 Springfield M1917 Enfield M1 Garand M1 carbine M1941 Johnson Rifle Submachine guns M1928/M1928A1/M1/M1A1 Thompson M2 Hyde M3/M3A1 'Grease gun' Reising M50/M55 United Defense M42 Grenades Mk 2 M7 grenade launcher Shotguns Winchester Model 1897 Ithaca M37 Winchester Model 1912 Browning Auto-5 Remington Model 31 Stevens M520-30/M620 Machine guns and larger M1917 Browning M1918 BAR M1919 Browning M1941 Johnson LMG M2 Browning Lewis Gun Bazooka M2 flamethrower M1A1 flamethrower Cartridges .22 LR .45 ACP .38 Special .30 Carbine .30-06 Springfield .50 BMG

Current U.S. infantry service weapons and cartridges Handguns M9 M11 Mk 25 P229R DAK M45A1 Mk 23 Mk 24 Glock 19 Rifles Assault Rifles and Battle Rifles M16 M27 Mk 16 Mk 17 Mk 14 M14 Carbines and Personal Defense Weapons HK416 M4 GUU-5/P M231 Mk 18 Designated Marksman Rifles Mk 14 M39 M14 M21A5 M25 Mk 12 SDMR SEAL Recon Rifle Anti-Materiel Rifles and Sniper Rifles M40 Mk 21 M2010 Mk 13 M110 Mk 11 Mk 20 M82 Mk 15 Shotguns M870 M500 M26 M1014 Submachine Guns MP5 MP7A1 Colt 9mm SMG Machine Guns M249 Mk 46 M27 M240 M60 Mk 48 Ordnance Grenade Launchers Mk 13 M320 M203 M79 XM25 M32 Mk 19 Mk 47 Mortars M120 M224 M252 M327 Rockets M72 M202 Mk 153 M141 M3 M136 Missiles BGM-71 TOW FGM-172 SRAW FGM-148 Javelin FIM-92 Stinger AFV Guns M242 M68 M256 Cartridges 12-gauge 9×19mm NATO .45 ACP 5.56×45mm NATO 7.62×51mm NATO .300 Winchester Magnum .50 BMG 40×46mm & 40×53mm 25×137mm