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Bullet exceeding supersonic speed at 500 yards (457 metres) [11] Rifle weight of 6 pounds (2.72 kilograms) Magazine capacity of 20 rounds; Select fire for both semi-automatic and fully automatic use; Penetration of US steel helmet through one side at 500 yd (457 m) Penetration of 0.135 inches (3.43 millimetres) steel plate at 500 yd (457 m)
The 5.56 mm round had to penetrate a standard U.S. helmet at 500 yards (460 meters) and retain a velocity over the speed of sound while matching or exceeding the wounding ability of the .30 carbine cartridge. [50] This request ultimately resulted in the development of a scaled-down version of the Armalite AR-10, named the ArmaLite AR-15. [51]
The 5.56 mm round had to penetrate a standard U.S. helmet at 460 metres (500 yd) and retain a velocity in excess of the speed of sound, while matching or exceeding the wounding ability of the .30 Carbine cartridge. [67] This request ultimately resulted in the development of a scaled-down version of the ArmaLite AR-10, called the ArmaLite AR-15 ...
The SL8 has a heavy profile, extended, 510 mm (20.1 in) barrel that does not have a flash hider or bayonet lug. The rifle uses a 10-round single-stack magazine and an extended top rail used to mount a wide variety of Picatinny-standard optics. Mounted to the rail are a set of iron sights with a hooded foresight and adjustable flip rear aperture.
The result was a weapon with somewhat less accuracy than the .308Win (7.62×51mm NATO) rounds, but with equal penetration and a trajectory so flat it could be fired with no sight adjustment out to 400 yards (370 m). Better yet the rounds were very light, and had almost no recoil in comparison to even the .22-caliber weapons under development.
The 5.56mm round had to penetrate a standard U.S. helmet at 500 yards (460 meters) and retain a velocity over the speed of sound while matching or exceeding the wounding ability of the .30 Carbine cartridge. [83] ArmaLite AR-15 with 25-round magazine An M16A1 with 30-round magazine
The ArmaLite AR-15 [note 3] is a gas-operated assault rifle manufactured in the United States between 1959 and 1964. [10] Designed by American gun manufacturer ArmaLite in 1956, it was based on its AR-10 rifle. The ArmaLite AR-15 was designed to be a lightweight rifle and to fire a new high-velocity, lightweight, small-caliber cartridge to ...
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.