1. A modified M16 rifle or M4 carbine, comprising: a bolt having a maximum outside diameter (K in FIG. 3C) greater than that of a standard M16/M4 bolt (existing M16A1-A4 versions and M4 and M4A1 versions); an ejector carried by the bolt; a bolt extractor pivoted to the bolt and ...
The AR-15 was developed as a more portable alternative to the 7.62-mm (.308-calibre) battlefield rifles of the day, but ArmaLite had limited success in marketing it to the U.S. military. The AR-15 design was licensed to Colt’s Patent Firearms Manufacturing Company (later Colt’s Manufa...
military researchers, dissatisfied with rifle-power ammunition, began to test a .22-inch (5.56-mm) cartridge that propelled a lighter projectile at a much higher muzzle velocity of 3,000 feet (910 metres) per second. To fire this small-calibre high-velocity round, in 1958 they chose the ...
(NATO) reluctantly agreed to standardize on a 7.62-mm cartridge that was a half-inch shorter than the M1 cartridge but of the same calibre and power. To fire this new round, the United States produced an improved version of the M1 rifle, featuring a 20-round detachable magazine and being...
military researchers, dissatisfied with rifle-power ammunition, began to test a .22-inch (5.56-mm) cartridge that propelled a lighter projectile at a much higher muzzle velocity of 3,000 feet (910 metres) per second. To fire this small-calibre high-velocity round, in 1958 they chose the ...