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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.
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. Weighing in at 35 oz (992 g), it is 6 oz (170 g) heavier than the new model, and 2 oz (57 g ...
The first variant, the Officer's Model Target appeared in 1904 as a Premium model more focused on sport shooting than on common use, it was produced in 7.94 mm (.32) and 9 mm (.38) calibers, with barrels whose lengths ranged from 4 in (101.6 mm) to 7.5 in (190.5 mm), with 6 in (152.4 mm) being the most common.
The COP .357 is an American 4-shot Derringer-type pistol chambered for .357 Magnum. The double-action weapon is about twice as wide and substantially heavier than the typical .25 automatic pistol , though its relatively compact size and powerful cartridge made it an option for a defensive weapon or a police backup gun.
After the proof test and if successful, two or three proof marks are always applied to the main (highly stressed) parts of the arm, namely the barrel, the chamber (when not part of the barrel) and the locking mechanism. These 3 essential parts are also weighed and their weight is recorded in a database together with the serial number.
M1911A1 and early M9 with magazines removed. In the 1970s, every branch of the U.S. Armed Forces (except the U.S. Air Force) carried the .45 ACP M1911 pistol.The USAF opted to use .38 Special revolvers, which were also carried by some criminal investigation/military police organizations, USAF strategic missile officer crews, and military flight crew members across all the services when serving ...
The .380 ACP was designed to be truly rimless, and headspaces on the case mouth instead of the rim for better accuracy. These relatively low-powered designs were intended for blowback pistols which lacked a barrel locking mechanism , which is often required for any handgun firing a round more powerful than a .380 ACP.
9-round (9×19mm) or 7-round (.45 ACP) single column, detachable box magazine The HK P9 is a semi-automatic pistol from Heckler & Koch in 9×19mm Parabellum , .45 ACP , and 7.65×21mm Parabellum and the first to use a variation of H&K 's roller delayed blowback system in a pistol format and polygonal rifling [ 1 ] now common in H&K designs.