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The AR-15's upper receiver incorporates the fore stock, the charging handle, the gas operating system, the barrel, the bolt and bolt carrier assembly. The lower receiver incorporates the magazine well, the pistol grip and the buttstock.
Bolt from a Karabiner 98k bolt-action rifle. Note the curved handle on the side for manual operation AR-15 bolt carriers AK-74 bolt and firing pin K31 bolt disassembled Slide locked back on a Desert Eagle pistol, showing the gas-operated rotating bolt mechanism
An AR-15–style rifle is a lightweight semi-automatic rifle based on or similar ... The upper receiver contains the bolt carrier assembly and is attached to the ...
The Colt AR-15 is a product line of magazine-fed, gas-operated, ... the barrel, the bolt and bolt carrier assembly. AR-15s employ a modular design. Thus one upper ...
short-stroke gas piston Short stroke gas piston and bolt carrier group, from a gas piston AR-15. With a short-stroke or tappet system, the piston moves separately from the bolt group. It may directly push [12] the bolt group parts, as in the M1 carbine, or operate through a connecting rod or assembly, as in the Armalite AR-18 or the SKS.
The Stoner bolt and carrier piston system is a widely known gas system designed by Eugene Stoner. The patent for the gas operated bolt and carrier system was filed in 1956 by ArmaLite for use in the AR-10, which was later developed into the ArmaLite AR-15, M16 rifle and M4 carbine.
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The forward assist is a button found on firearms with non-reciprocating (i.e. not attached to the bolt/bolt carrier) cocking handles, commonly on AR-15 rifle derivatives, such as the M16 rifle, and is usually located on the receiver near the bolt closure. [1]