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The Springfield Armory M1A is a semi-automatic rifle made by Springfield Armory, Inc., beginning in 1971, based on the M14 rifle, for the civilian and law enforcement markets in the United States. "M1A" is a proprietary name for Springfield Armory's M14-pattern rifle.
A standard .30 Carbine ball bullet weighs 110 grains (7.1 g), a complete loaded round weighs 195 grains (12.6 g) and has a muzzle velocity of 1,990 ft/s (610 m/s) giving it 967 ft·lbf (1,311 joules) of energy, when fired from the M1 carbine's 17.75 in (451 mm) barrel.
The United States Marine Corps Designated Marksman Rifle (DMR, NSN 1005-01-458-6235; more formally the United States Rifle, Caliber 7.62 mm, M14, DMR) is a semi-automatic, gas-operated rifle chambered for the 7.62×51mm NATO cartridge.
The .30 carbine's relatively straight case and round nose bullet have misled some to believe it was designed for use in pistols.) The .30 carbine uses a lighter bullet (110 grain versus 165 grain) and improved powder. As a result, it has approximately 41% higher muzzle velocity with 27% more impact energy than the parent .32 WSL cartridge.
Bullet drop and wind drift are shown both in mil and moa. The 7.62×51mm NATO has a 3.38 mL (52.0 gr H 2 O) cartridge case capacity. The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt-action rifles and machine guns alike, under extreme conditions.
The 500 gr (32 g) bullet is seen as the standard weight for a 45 caliber (11.43 mm) rifle bullet. This bullet has a sectional density of .341, which provides the bullet a high penetrative value at a given velocity. Among standard sporting cartridge bullets, the 45 caliber (11.43 mm) 500 gr (32 g) bullet has the highest sectional density.
The M21 sniper weapon system (SWS) in the US Army is a national match grade M14 rifle, selected for accuracy, and renamed the M21 rifle. [7] The M21 uses a commercially procured 3–9× variable power telescopic sight, modified for use with the sniper rifle. [8]
The Winchester Super-X Silvertip consists of a 200-grain (13 g) pointed soft point bullet with an advertised muzzle velocity of 2,490 ft/s (760 m/s), and an advertised muzzle energy of 2,753 ft⋅lbf (3,733 J). [5] Cartridge cases can be formed from .308 cases. [4]