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The SOCOM 16 and SOCOM II are largely identical to the standard M1A, but feature a 16.25-inch (413 mm) barrel, rather than the standard model's 22-inch (560 mm) barrel. The specially designed muzzle brake is designed to reduce the increased recoil produced by the shorter barrel.
A SOCOM variant of the M1A. The company's rifle offerings include the M1A, the Hellion (imported VHS-2), and the SAINT line of AR-15 style rifles and short-barreled rifles. The M1A line includes offerings such as standard, loaded, SOCOM, national match, and tanker models.
When the connector assembly was disengaged, the rifle could only be fired semi-automatically and functioned in a manner similar to the M1 rifle. The T20 had an overall length of 48 + 1 ⁄ 4 inches, a barrel length of 24 inches, and weighed 9.61 lb without accessories and 12.5 lb with bipod and empty magazine. It was designated as limited ...
In comparison, the "standard" load for the .30 Carbine has a .30 Carbine ball bullet weighing 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 90 mm gun M1/M2/M3 was an American heavy anti-aircraft and anti-tank gun, playing a role similar to the German 8.8cm Flak 18.It had a 3.5 in (90 mm) diameter bore, and a 50 caliber barrel, giving it a length of 15 ft (4.6 m).
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⋅lb f (1,311 joules) of energy when fired from the M1 carbine's 18-inch barrel.
The Springfield Armory EMP is a semi-automatic pistol based on the classic M1911 design and manufactured by Springfield Armory, Inc. Whereas the M1911 uses the .45 ACP cartridge, the EMP uses smaller 9×19mm Parabellum or .40 S&W cartridges.
Since barrel length is limited by practical concerns to about arm's length for a rifle and much shorter for a handgun, increasing bore diameter is the normal way to increase the efficiency of a cartridge. The limit to bore diameter is generally the sectional density of the projectile (see external ballistics).