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A 5.56 NATO round fired from a 20 in (510 mm) barrel has a flatter trajectory than a 7.62 NATO round fired from a barrel of equal length, while the 5.56 NATO fired from a 14.5 in (370 mm) barrel has the same trajectory as the 7.62 NATO from a 20 in barrel, as well as the same time of flight.
.458×2-inch American.458 Express.458 HAM'R.458 Lott.458 SOCOM.458 U.S. Silent Sniper.458 Winchester Magnum.460 Steyr.460 Weatherby Magnum.461 Gibbs.465 H&H Magnum.500/465 Nitro Express.470 Nitro Express.475 Nitro Express.475 No 2 Nitro Express.476 Nitro Express.499 Leitner-Wise
The .458 SOCOM (11.63×40mmRB) is a moderately large round designed to work in an AR-15 platform.This is achieved by installing a 458 bolt and barrel. The 300-grain (19 g) round offers a supersonic muzzle velocity of 1,900 ft/s (580 m/s) and 2,405 ft⋅lbf (3,261 J), [1] similar to a light .45-70 but with a much smaller case.
M21-5 CQB Carbine with 10.5 inch long barrel; M21-5 Carbine with 14.5 inch barrel; M21-5 Standard with 16-inch barrel; M21-5 DMR Sniper rifle with 18-inch barrel; The rifle features ambidextrous control levers for the magazine release and safety. [citation needed]
Barrel manufacturers include X-Caliber, McGowen, AR Precision, and PAC-NOR. By the end of April 2016, more than 1,000 .277 Wolverine barrels had been sold, with more than 2,000 by mid-November 2017. [citation needed] Barrels lengths include: 8.2, 10.5, 12.5, and 14.5 inch pistol; 16, 18, and 20 inch rifle.
This is a graph of a simulation of the 5.56 mm NATO round, being fired from a 20-inch (510 mm) barrel. The horizontal axis represents time, the vertical axis represents pressure (green line), bullet travel (red line), and bullet velocity (light blue line).
These variants are heavier than the CR 223 and can be ordered with longer 457 mm (18.0 in) or 508 mm (20.0 in) barrels and a two-stage trigger. [113] [117] [118] The B&T 15 is a short-barreled rifle variant of the CR 223, manufactured by Brügger & Thomet. B&T plans to have the weapon ready for import into the United States by mid-2021. [119]
The Heckler & Koch HK437 chambered in .300 Blackout and features a 7- and 9- inch barrel was originally announced along with the HK433 in 2017. In late 2022, the Ministry of the Interior, Municipal Affairs, Housing and Sports of the State of Schleswig-Holstein commissioned Heckler & Koch Germany to manufacture and supply the HK437.