Since 1886, most firearms use smokeless powder. Because of its burning properties and the amount of heat and gas volume that it generates, gunpowder has been widely used as a propellant in firearms and as a pyrotechnic composition in fireworks. ![]() It burns rapidly, producing a volume of hot gas made up of carbon dioxide, water, and nitrogen, and a solid residue of potassium sulfide. Black powder also called gunpowder: A mixture of sulfur, charcoal, and potassium nitrate.The bipod permits the operator to rest the weapon on the ground, a low wall, or other object, reducing fatigue and permitting increased accuracy. On firearms, bipods are commonly used on rifles and machine guns to provide a forward rest and reduce motion. Bipod: A support device that is similar to a tripod or monopod, but with two legs.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. ![]()
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