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The KAC's lower receiver, holding the magazine and trigger assembly, is essentially a shortened M16 rifle lower receiver, which makes the basic operating controls familiar to many potential users. [citation needed] However, the cartridge, upper receiver, and operating mechanism are all new designs by KAC. [2]
The lower receiver is a standard M16 select fire unit. M16Ks are quite rare and very collectible. [citation needed] The later M16K-45 variant was produced using proprietary upper and lower receivers designed by Timothy F. La France specifically for the .45 ACP round. Both are forgings.
The Monolithic Rail Platform (MRP) [3] was created by the company, a one-piece, Picatinny-topped AR-15-pattern upper receiver made from a forged aluminum block. [4] The MRP upper receiver has a quick-change barrel system. [5] Its top rail position matches M4 and E3-type weapons for optical and sight compatibility. [6]
ArmaLite AR-15 with the charging handle located on top of the upper receiver, protected within the carrying handle and a 25-round magazine. 1973 Colt AR-15 SP1 rifle with "slab side" lower receiver (lacking raised boss around magazine release button) and original Colt 20-round magazine.
The lower receiver will also accept older mil-spec M16 or M16 upper receivers with an adapter. Receivers will be available that accept 5.56×45mm NATO rounds, 6.8×43mm Remington SPC rounds, 7.62×39mm rounds, and 7.62×51mm NATO rounds. Each upper receiver has its own rail system, which allows scopes, or other optics to be pre-sighted for each ...
A stripped lower receiver, one that is lacking the additional parts included in a completed lower receiver, is the only part of an AR-15–style rifle that needs to be transferred through a federally licensed firearms dealer under United States federal law. [42]
The M16 is a lightweight, 5.56 mm, air-cooled, gas-operated, magazine-fed assault rifle, with a rotating bolt. The M16's receivers are made of 7075 aluminum alloy, its barrel, bolt, and bolt carrier of steel, and its handguards, pistol grip, and buttstock of plastics.
A disassembled Mauser action showing a partially disassembled receiver and bolt. In firearms terminology and 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 ...