Armalite AR-15 Rifles is yet another advanced, accurate and rugged lineup of firearms from the house of Armalite. It is essentially an intermediate cartridge, air cooled firearm that is equipped with a rotating lock bolt. This is initiated by a piston within the bolt carrier or by a traditional long/ short stroke piston operation. The rifle is quite lightweight and magazine fed. The AR-15 Rifle is manufactured with a generous dose of aluminum alloys and synthetic materials, and divided into several versions. This consists of multiple semi-automatic and select fire models.The Armalite AR-15 Rifles were first produced in 1959 in the form of small arms rifle for the United States armed forces. Owing to financial problems, the design was sold to Colt, post which it underwent some modifications. The new or redesigned rifle was then accepted as the M16 rifle and later as the semi-automatic version (for civilians) as the Colt AR-15.