![]() ![]() This term may be used specifically (as above) or generally, as in “I prefer. 45 Automatic Colt Pistol cartridge designer. 45 ACP has a bore/projectile diameter of ~.45” and the case dimensions specified by the. A pistol in caliber 9x19 (also known as 9mm, 9mm Para, 9mm Parabellum) has a bore/projectile diameter of ~9mm, with a case length of 19mm. This may be designated in metric or “standard” units. In common usage, “caliber” refers to the dimensions of the firearm’s ammunition and barrel diameter. The buttpad or buttplate is a separate piece at the back of the buttstock, which protects the shooter from excessive recoil or protects the buttstock when placed on the ground, or both. This may be a separate piece, or it may be integral with a one-piece stock. The buttstock is the entire portion of the stock to the rear of the firing grip. On a rifle or shotgun, the butt is the rear of the gun where it meets the shooter’s shoulder. An internal mechanical device limits the burst to the specified number of rounds. This term refers to the capability of some submachine guns or machine guns to fire 2, 3, or 4-round “bursts” with each press of the trigger. Often used in indoor shooting ranges, a backstop that safely catches and contains fired projectiles. Buckshot is often used for self-defense or tactical purposes. 36” in diameter), through 00 “double-aught” (at. Sizes of common buckshot pellets range from 000 or “triple-aught” buck (at. Much larger than birdshot, buckshot is so named because it is composed of pellets suitable for hunting larger animals like “bucks”/deer. In basic orientation terms, the breech is the opposite of the muzzle. The part of the barrel/action that is opened to allow insertion of ammunition, usually at the rear of the barrel. Traditionally, most cartridge casings are made of brass or contain brass. Sometimes incorrectly spelled “muzzle break.” BrassĬommonly used to describe empty cartridge casings. Brake, muzzle brakeĪ device fitted or integral to a firearm’s muzzle is intended to reduce the amount of recoil the shooter feels by redirecting the expanding gases to the side. Birdshot is composed of very small lead (or bismuth, or tungsten, or steel) pellets that, when fired, create a cloud of tiny projectiles suitable for hitting flying birds or airborne targets. Shotguns can fire a wide range of ammunition types. Typically used to describe the removable bottom portion of a detachable box magazine. The interior of the firearm’s barrel, as in “be sure to clean the bore” or “inspect the bore for copper fouling.” Basepad, base pad, baseplate You might hear old-timers say phrases like, “I drew a bead on him,” which means to aim carefully. In common usage, a bead or bead sight is a basic type of front sight, usually on a shotgun barrel, comprising a simple metal or polymer sphere brazed or screwed into the barrel or sight rib. “Blackpowder substitutes” are modern powders that can safely be used in black powder firearms. Today, antique or replica black powder firearms are used for fun, hunting, and competition, but almost all modern firearms designs use “smokeless powder” which is more stable, powerful, and clean-burning than black powder, in addition to being less corrosive. Until the end of the 19th century, all firearms burned the same type of gunpowder or “black powder” in different granulations. The barrel is the tube-shaped part of a firearm through which the projectile travels. Usually the latter are called “full-auto” or “fully automatic” for clarity. This term may refer informally to any semi-automatic firearm, or it may refer to fully automatic machine guns that are capable of firing multiple rounds with a single pull of the trigger. Often incorrectly defined to mean “Assault Rifle,” the AR in the name originally came from “ArmaLite Rifle.” Automatic, autoloader, auto A general term used to describe the AR-15 type rifle and clones, originally designed and developed by Eugene Stoner and Jim Sullivan. ![]()
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