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A disassembled Mauser action showing a partially disassembled receiver and bolt. In firearms terminology and at law, the firearm frame or receiver is the part of a firearm which integrates other components by providing housing for internal action components such as the hammer, bolt or breechblock, firing pin and extractor, and has threaded interfaces for externally attaching ("receiving ...
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]
The U-shaped receiver is stamped from a smooth 1.5 mm (0.06 in) sheet of steel compared to the 1.0 mm (0.04 in) sheet metal receiver used on the standard AKM rifles. It uses a modified AKM recoil spring assembly that consists of a rear spring guide rod from the AK and a new forward flat guide rod and coil spring.
Most AR-15 and many AK manufacturers now make lower receivers which qualify as "Off-List" Lower (OLL) receivers which are legal to possess and use in the state of California. Before trying to acquire one, ensure that it's not marked with any make/model combination appearing on the Roberti-Roos list (30510 PC) or its regulatory echo in 11 CCR ...
Magpul created a larger variation of their PMAG magazine, called the "Black Widow," with a blood-red follower for the 6.8mm round. The upper and lower receivers were developed specifically to fit this Magpul magazine and optimized around the 6.8×43mm round. The flagship model of the Six8 series is the UCIW which features an 8.5-inch barrel.
AR-15s are modular firearms, and maker's marks are usually applied to the lower receiver, which houses the trigger group. A person with an AR-15 lower receiver can assemble a complete firearm using widely available, commercial and unregulated components, such as barrels, stocks, and upper receivers. [2]
Currently Smith & Wesson makes the lower receiver in-house while the barrel is supplied by Thompson/Center, a S&W company. In May 2008, Smith & Wesson introduced its first AR-variant rifle in a caliber other than 5.56 NATO. The M&P15R is a standard AR-15 rifle chambered for the 5.45×39mm cartridge. [59]
The SA80 (Small Arms for the 1980s) is a British family of 5.56×45mm NATO service weapons used by the British Army. [4] The L85 Rifle variant has been the standard issue service rifle of the British Armed Forces since 1987, replacing the L1A1 Self-Loading Rifle.