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The length of the barrel (especially for larger guns) is often quoted in multiples of the caliber, used, for example, in US naval rifles 3 in (76 mm) or larger. [2] The effective length of the barrel (from breech to muzzle) is divided by the barrel diameter to give a dimensionless quantity.
The 16th caliber is known as "lordly" (Russian: барский). While shotgun bores can be expressed in calibers (the .410 bore shotgun is measured as .410 in (10.4 mm) in diameter, [12] unlike with rifles the actual bore diameter of a smoothbore shotgun varies significantly down the length of the barrel, with the use of chokes and back-boring.
The 4-inch (102 mm) Mark 1 Mod 0 was a built-up gun constructed in a length of 40 caliber. The Mod 0 had a tube, jacket, and two hoops , hooped to 50 in (1,300 mm) from the muzzle, all of gun steel.
Test barrel length: 180 mm Source(s): HK USA [ 3 ] HK USA [ 4 ] Modern Firearms, Pistol / SMG ammunition Heckler & Koch Products [ 5 ] The 4.6×30mm (designated as the 4,6 × 30 by the C.I.P. ) [ 6 ] cartridge is a small- caliber , high- velocity , smokeless powder , rebated , bottleneck , centerfire cartridge designed for personal defense ...
These had a new, short, smoothbore barrel length of 35 millimetres (1 + 3 ⁄ 8 in), with an overall length of 170 millimetres (6 + 3 ⁄ 4 in), and a 10 millimetres (0.39 in) bore, in addition to having the cylinder chambers reamed to accept the special QSPR ammunition which externally resembled metal-cased .410-bore shotgun shells, but ...
The UCP was to be the companion sidearm to the HK MP7, using the same HK 4.6×30mm cartridge. The 4.6×30mm round is a direct competitor to the 5.7×28mm by Fabrique Nationale de Herstal (FN). As such, the UCP would have been a direct competitor to the FN Five-seven pistol.
Gun No. 213 had a liner. The gun was described as a 5-inch (127 mm) gun but with a 4-inch bore in the 1902 handbook, this indicated its higher power and also the fact the barrel was actually more the size of a 5-inch/40 caliber gun than a 4-inch gun. The ammunition was about 7 lb (3.2 kg) heavier than a 4-inch/40 caliber round.
The original Mk XVI had an A tube, jacket to 63.5 inches (1.61 m) from the muzzle and a removable breech ring. The Mk XVI* replaced the A tube with an autofretted loose barrel with a sealing collar at the front of the jacket. The Mk XXI was a lighter version with an autofretted monobloc barrel and a removable breech ring.