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The first project undertaken by the company was an injection molded AR-15 rifle lower receiver. The company then moved to AR-10 style rifle lower receivers, and finally pistol receivers. [14] The name of the company refers to the injection molding process combined with the common designation of unfinished receivers as "80% receivers". [14]
Carbon 15 rifles have carbon fiber upper and lower receivers which are lighter than the standard aluminum and steel construction of AR-15 receivers. Carbon 15 rifles are generally chambered in 5.56×45mm NATO/.223 Remington, [4] although Bushmaster also produced 9×19mm Parabellum versions of the pistol and carbine. [citation needed] In early ...
AR-15 rifles showing their configurations with different upper receivers. The lower receiver is visible at the bottom. For the purposes of United States law, the receiver or frame is legally the firearm, [4] and as such it is the controlled part. The definition of which assembly is the legal receiver varies from firearm to firearm, under US law.
The addition of a proprietary hydraulic buffer system in the receiver back plate helps control recoil. [6] More than 50% of the APC's parts are interchangeable between the different platforms. [2] The APC's upper receiver is made from aerospace-grade alloy, and the lower receiver, pistol grips, magazine, and butt stock are made from polymer. [7]
The lower receiver incorporates the magazine well, the pistol grip, the buttstock, the buffer and the buffer spring. The lower receiver also contains the trigger, disconnector, hammer and fire selector (collectively known as the fire control group). Full-sized rifles use a fixed buttstock, while carbines generally use an adjustable telescoping ...
The KG-9 and KG-99 have an open-end upper receiver tube where the bolt, recoil springs, and buffer plate are held in place by the plastic/polymer lower receiver frame. This design only allows for 115 grains (7.5 g) 9mm ammunition, and if a heavier grain ammunition or hot loads are used, the plastic lower receiver will fail or crack, rendering ...
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Controls are mostly ambidextrous including the charging handle but not the bolt release. Sig produces four stock configurations are available for the MCX carbine. [10] [13] The overall layout of the two rifles is similar. [14] SIG designed the upper receiver to be compatible with standard AR-15 and M16 lower receivers [10] [12] with the help of ...