Heckler & Koch HK4
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| HK4 | |
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| Type | Semi-automatic pistol |
| Place of origin |  West Germany |
| Service history | |
| In service | German Federal Police |
| Production history | |
| Designer | Heckler & Koch |
| Designed | 1967 |
| Manufacturer | Heckler & Koch, MAS |
| Produced | 1968-1984 |
| Specifications | |
| Weight | 480 g |
| Length | 157 mm |
| Barrel length | 85 mm |
| Width | 32 mm |
| Height | 110 mm |
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| Cartridge | .22 Long Rifle .25 ACP .32 ACP .380 ACP |
| Action | Straight blowback, unlocked breech |
| Muzzle velocity | 356 m/s (MAG-95, MAG-98, MAG-98c) |
| Effective range | Sights ranged for 25 m |
| Feed system | 7, 8-round box magazine |
| Sights | Fixed, front post and rear notch, sight radius 121 mmm |
The HK 4 pocket pistol was first introduced by Heckler & Koch in 1967 making it the first pistol produced by the company. Mass production of this pistol started in 1968 and continued until 1984. There were approximately thirty-eight thousand pistols produced during this time, serial numbered 10001 to 36550. Twelve thousand of these pistols were produced for the German police and other government agencies with the .32ACP caliber and are designated P11 and serial numbered 40001 to 52400.
An additional 2000 were made around 1971 as a commemorative set with a golden trigger and gold name plate. The HK 4 was designated 4 because the pistol had the ability to be modular. This meant that the pistol could accommodate 4 different calibers by a simple replacement of the barrel, return spring, and the magazine. The four calibers that the pistol could use are: the rimfire .22 LR (5.6 Long Rifle) round; .25 ACP (6.35x16mmSR); .32 ACP (7.65x17mm Browning SR); .380 ACP (9x17mm Short). Most pistols were sold in .380 ACP and .32ACP; the other 3 calibers were sold as a kit with the appropriate barrels and magazines. This is a straight blowback double action pistol meaning it is cocked and fired with the trigger for the first shot. It is thought that the design of the HK 4 is based on that of the Mauser HSc.
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