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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] Variants include the Bushmaster M4-type Carbine , Patrolman series, QRC series, Bushmaster XM15-E2S, and the Carbon 15 line.
Rifles styled like the AR-15 come in many sizes and have many options, depending on the manufacturer. The lower receiver, without the receiver extension, rear takedown pin, and buttstock, is shown at bottom. An AR-15–style rifle is a lightweight semi-automatic rifle based on or similar to the Colt AR-15 design.
The Bushmaster M4 [2] or M4A3 [3] is a semi-automatic or select-fire carbine size assault rifle manufactured by Bushmaster Firearms International, modeled on the AR-15. It is one of the Bushmaster XM15 line of rifles and carbines.
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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.
The scope base is the attachment interface on the rifle's receiver, onto which the scope rings or scope mount are fixed. Early telescopic sights almost all have the rings that are fastened directly into tapped screw holes on the receiver, hence having no additional scope base other than the receiver top itself.
A Rock River Arms AR-15 rifle, with ammunition: The weapon is similar in style to the Bushmaster XM-15 rifle that was used during the Sandy Hook Elementary School massacre in Newtown, Conn. When ...
The AR-10 is slightly larger and heavier than the AR-15. It was originally designed to chamber the military 7.62x51 NATO cartridge (also .308), which has a COAL of 2.800" (71.12mm) 45 Raptor , uses the standard 7.62 NATO case, cut to a length of 1.800" from 2.015", resulting in a straight-wall cartridge, neck is sized to 0.452".