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the study of the effects of being fired on a bullet, cartridge, or gun. The metal tube through which the bullet is fired. The end of the barrel attached to the action. The projectile. They are shaped or composed differently for a variety of purposes. the internal diameter or bore of a gun barrel a casing containing a charge and a bullet or shot for small arms or an explosive charge for blasting a rifle, pistol, or other portable gun a rifle, pistol, or other portable gun residue deposited on the hands and clothes of someone who discharges a firearm The raised portions of the rifling are known as lands and the recessed portions are known as grooves. When a weapon is fired, these lands and grooves cut into the bullet, putting spin on it as it travels through the barrel of a firearm. the open end of the barrel of a firearm. a small firearm designed to be held in one hand. a pistol with revolving chambers enabling several shots to be fired without reloading. a gun, especially one fired from shoulder level, having a long spirally grooved barrel intended to make a bullet spin and thereby have greater accuracy over a long distance. the arrangement of spiral grooves on the inside of a rifle barrel. the part of handgun ammunition that contains the primer and propel- lent powder to discharge the projectile. the path followed by a projectile flying or an object moving under the action of given forces. National Integrated Bullet Identification System