Especially the non-shouldered (non-"bottlenecked") magnum rifle cartridges could be pushed too far into the chamber and thus cause catastrophic failure of the gun when fired with excessive headspace the addition of the belt to the casing prevented this over-insertion. This design originated with the British gunmaker Holland & Holland for the purpose of headspace certain of their more powerful cartridges. Belted magnum or belt: Any caliber cartridge, generally rifles, using a shell casing with a pronounced "belt" around its base that continues 2 to 4 mm past the extractor groove.Belt: An ammunition belt is a device used to retain and feed cartridges into some machine guns in place of a magazine.Bayonet lug: An attachment point at the muzzle end of a long gun for a bayonet.Battle rifle: A service rifle capable of semi-automatic or fully automatic fire of a full-power rifle cartridge.Often broken down into internal ballistics, transitional ballistics, external ballistics and terminal ballistics. Ballistics: a field of mechanics concerned with the launching, flight behavior and impact effects of projectiles.BC is a function of mass, diameter, and drag coefficient. It is inversely proportional to the deceleration – a high number indicates a low deceleration. Ballistic coefficient (BC): A measure of a projectile's ability to overcome air resistance in flight.On machine guns, a barrel nut is a screw on component at the rear of the barrel that has locking lugs and a notch for quick barrel change and helps install it in the trunnion. On handguards, a barrel nut may refer to the component that holds the handguards to the barrel. Barrel nut: A firearm component used on barrels.Barrel: A tube, usually metal, through which a controlled explosion or rapid expansion of gases are released to propel a projectile out of the end at high velocity. ![]() They are, however, still commonly used with shotguns, as a traditional bandolier conveniently stores individual shells. Bandoliers are now rare because most military arms use magazines, which are not well-suited to being stored in a bandolier. ![]()
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