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Bushmaster Dissipator Model XM-15 rifle with aftermarket handguards The Bushmaster XM-15 used by the D.C. snipers during their attacks in October 2002. The Bushmaster XM-15 series (or XM15 [3]) is a line of AR-15 style semi-automatic rifles and carbines manufactured by Bushmaster Firearms International, LLC. [2]
Bushmaster Firearms originally produced their 'First Generation' rifle using an aluminum lower receiver and a stamped steel upper receiver. This first-generation model used a long-stroke gas piston operating system. The recoil spring was within the upper barrel gas system compared to the AR-15/M-16, where the recoil spring is within the butt stock.
All barrels are free-floated within the handguard to achieve consistent accuracy. The barrel is like an AR-15 barrel with a resized gas port and a thin profile for the piston support. The bolt group also is made as a single unit, with captive return spring and rotary multi-lug bolt which locks directly to the barrel breech. [35]
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.
To address carbon fouling and a short-barreled timing issue related to traditional AR-15s, POF-USA developed the Regulated Short-Stroke Gas Piston System. Rather than operating gas being injected directly into the upper receiver like a traditional AR-15, the technology pushes a piston that acts on an operating rod, which acts on the bolt ...
The firearm was a new design, having a rotating bolt combined with a long stroke gas piston system similar to the AK-47 rifle. [2] [3] Some AR-15 parts were used in its construction and it used STANAG type magazines. [4]
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.
R5 RGP (Remington Gas Piston) is a carbine that was designed and manufactured by Remington Arms. [4] [5] It is an AR-15 type rifle which uses a unique mid-length gas piston operating system in an attempt to improve the reliability of the weapon, [6] [better source needed] and featured a monolithic upper, as the upper receiver and handguard were machined as a single piece.