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Diagram of long-stroke gas operation system Long stroke gas piston, from an AK-74. With a long-stroke system, the piston is mechanically fixed to the bolt group and moves through the entire operating cycle. This system is used in weapons such as the Bren light machine gun, AK-47, Tavor, FN Minimi, FN MAG, FN FNC, and M1 Garand.
The AK-47 was designed to be a simple, reliable fully automatic rifle that could be manufactured quickly and cheaply, using mass production methods that were state of the art in the Soviet Union during the late 1940s. [41] The AK-47 uses a long-stroke gas system generally associated with high reliability in adverse conditions.
The cylinder is most often ... hence reducing the required range of motion by the shooter from four movements ... Long-stroke gas piston: M1 Garand, AK-47, FN ...
Examining the 'quintessential' short-stroke (the AR-18), gas is vented through two holes and the energy of the piston moving is imparted to the bolt carrier through transfer from the tappet rod. But the problem is, that's the same way on the AK-47. The difference is the AK-47 DRAGS the piston and piston rod with it through the rest of the stroke.
The AK-47 is a select-fire, 7.62×39mm, air-cooled, long-stroke-piston gas-operated, magazine-fed rifle, with a rotating bolt. It was designed to be a simple, reliable automatic rifle that could be manufactured quickly and cheaply, using mass production methods that were state of the art in the Soviet Union during the late 1940s.
Firearms with a direct impingement design can, in principle, be constructed lighter than piston-operated designs. Because high-pressure gas acts directly upon the bolt and carrier in a direct impingement system, it does not need a separate gas cylinder, piston, and operating rod assembly of a conventional piston-operated system, only requiring a gas tube to channel gas from the barrel back ...
A valve is fitted to the right side of the gas block, allowing the gas to be shut off (preventing it from leaving the barrel via the gas port) when the grenades are fired. When using the rifle to launch grenades, a special rubber recoil pad is used and a special 10-round magazine is inserted. [ 2 ]
The gas relief ports are located on the gas tube like the AK-47, unlike the AKM which had the gas relief ports relocated forward to the gas block. The gas block is also like the AK-47 in that it has the forward sling loop (instead of the handguard) and a cleaning rod capture.