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This is a list of firearm cartridges which have bullets in the 12 millimetres (0.47 in) to 12.99 millimetres (0.511 in) caliber range.. Length refers to the cartridge case length.
The GAU-19/A is designed to accept standard NATO .50 caliber M9-linked ammunition. The rate of fire is selectable to be either 1,000 or 2,000 rounds per minute. The Humvee armament kit version fires at 1,300 rounds per minute.
Another difference between the C-9 and C-9 Comp. is the barrel length. Its 4 in (102 mm) barrel is 1 ⁄ 2 in (12.7 mm) longer than its sister weapon's providing for better accuracy and balance. The compensator and extra bulk also increase the weight.
There are two main Bekas-M models: the Bekas-12M and the Bekas-16M (the number denoting the gauge), both chambered for 2.75-inch (70 mm) shells. They come in four barrel lengths: a 535 mm cylinder-bore barrel with open sights and 680 mm, 720 mm and 750 mm barrels with three screw-in chokes (0.0 mm, 0.5 mm and 1.0 mm) and have a ventilated rib ...
The 12.7 × 108 mm has 22.72 ml (350 grains) H 2 O cartridge case capacity. 12.7 × 108 mm maximum cartridge dimensions. [citation needed] All sizes in millimeters (mm). Americans define the shoulder angle at alpha/2 ≈ 18.16 degrees. According to guidelines the 12.7 × 108 mm case can handle up to 360 MPa (52,213 psi) piezo pressure.
The C.I.P. recommends that commencement of rifling begin at 8.97 mm (0.353 in). Bore diameter is given as 12.55 mm (0.494 in) and groove diameter is 12.80 mm (0.504 in). The C.I.P. recommends a five groove barrel contour with each groove having an arc length of 5.33 mm (0.210 in) and a twist rate of one revolution in 406 mm (16.0 in).
A U.S. firearms manufacturer, Ameetec Arms LLC of Scottsdale, Arizona, started the manufacture of a USAS-12 semi-automatic clone in 2007, called the WM-12; it mainly differs from the USAS-12 by the lack of fixed sights and carrying handle, replaced by a Picatinny rail.
Changes to the rifle include cutting back the fixed stock and integrating a folding adjustable stock, a Desert Tan finish color, and a front loading quick change barrel for caliber change. As of 2011, the only barrel and caliber offered was a 24.5 in (620 mm) fluted barrel with a 1:10" right hand twist chambered for .338 Lapua Magnum. [5] [6] [7]