The AR-15 is a lightweight, intermediate cartridge magazine-fed, air
cooled rifle with a rotating-lock bolt, actuated by direct impingement
gas operation or long/short stroke piston operation. It has been
produced in many different versions, including numerous semi-automatic
and selective fire variants. It is manufactured with extensive use of
aluminum alloys and synthetic materials The
AR-15 was first built by ArmaLite as a small arms rifle for the United
States armed forces. Because of financial problems, ArmaLite sold the
AR-15 design to Colt. After modifications (most notably the relocation
of the charging handle from under the carrying handle like the AR-10 to
the rear of the receiver), the new redesigned rifle was subsequently
adopted as the M16 rifle. Colt then started selling the semi-automatic
version of the M16 rifle as the Colt AR-15 for civilian sales in 1963
and the term has been used to refer to semi automatic-only versions of
the rifle since then. Alt hough the name "AR-15" remains a Colt
registered of the firearm are indepe
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