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A schematic of the lever-delayed blowback mechanism used in the FAMAS assault rifle. Lever-delayed blowback utilizes leverage to put the bolt at a mechanical disadvantage, delaying the opening of the breech. When the cartridge pushes against the bolt face, the lever moves the bolt carrier rearward at an accelerated rate relative to the light bolt.
The receiver housing is made of a special steel alloy, and the rifle furniture is made of fiberglass. The rifle uses a lever-delayed blowback action, an action type also used in the French AA-52 machine gun derived from the prototypes built during Army Technical Department tests having taken place between the First and Second World Wars.
The Heckler & Koch SL6 is a roller-delayed blowback operated sporting carbine made by Heckler & Koch. It was chambered in 5.56×45mm NATO. The design was originally based on the Heckler & Koch 630 hunting rifle and is essentially a shorter-barreled version of that rifle. It was marketed throughout the world as a hunting/utility rifle. [1]
Another recent contender is the ČZW-556 assault rifle and ČZW-762 light machine gun which both use lever-delayed blowback which has more reliable accuracy and performance over the gas operation. In 2011, the Czech army started replacing vz. 58 with CZ-805 BREN. While vz. 58 still remains the main assault rifle of the Slovak army, the Slovak ...
Pages in category "Lever-delayed blowback firearms" The following 11 pages are in this category, out of 11 total. ... Danuvia 43M submachine gun; F. FAMAS; FNAB-43; K ...
Unlike the roller-delayed blowback military Heckler & Koch rifles the cocking handle is situated far more rearward and on the right side and features a camming system to help overcome the initial friction exerted by the "bolt head locking lever" anti-bounce mechanism that prevents the bolt from bouncing off the barrel's breech surface.
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This additional force allowed the small .22 Long Rifle cartridge to cycle a standard weight slide, which made the pistol handle more like the standard .45 ACP version. [ 11 ] Another cartridge conversion was the Pedersen device , which was designed to convert the bolt action Springfield 1903 Mark I into a 40 shot blowback semi-automatic firearm ...