TKB-517
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The Avtomat Korobov TKB-517 is delayed blowback operated weapon, that uses two-part bolt system, designed prior to WW2 by Paul Kiraly of Hungary. In this system, bolt has two parts - lighter breechblock with breechface and extractor, and heavier bolt carrier. A two-arm lever is interposed between these two parts; lower arm of the lever rests against the receiver when bolt is fully closed. When gun is fired, pressure in the chamber forces the cartridge case backwards and against the breechface. Bolt begins to travel back, but the lever acts as a mechanical disadvantage, transferring the short movement of the light bolt to the longer movement of the heavy bolt carrier. This action is sufficient to slow down initial movement of the breechface before the bullet leaves the barrel. Once the pressure in the barrel is low enough, the lever breaks the contact with the receiver, and the rest of recoil cycle both bolt parts complete as a single unit. Similar system later has been used in the French FAMAS assault rifle. The receiver of the TKB-517 has been made from stamped steel, furniture was made from wood. Charging handle was attached to the bolt carrier at the right side. Safety / fire mode selector was located above the pistol grip, also at the right side of the gun. The TKB-517 used standard AK/AKM type magazines, including large-capacity 40 and 75-round ones, developed for the RPK light machine gun.
Caliber: 7.62x39mm M43
Action: Lever-Delayed Blowback
Overall length: n/a
Barrel length: n/a
Weight: 3,8 kg
Rate of fire: approx. 600 rounds per minute
Magazine capacity: 30 rounds
