The Definition of Gauge
System of measurement for the internal bore diameter of a smooth-bore firearm based on the diameter of each of that
number of spherical lead balls whose total weight equals one pound.
The internal diameter of a 12 gauge shotgun barrel is therefore equal to the diameter of a lead
ball weighing 1/12 pound, which happens to be .729" (Or in British: Bore.) The Gauge/Bore system is also used, by convention, to describe the internal barrel diameter of large-bore,
19th century, English, single-shot and double-barrel rifles.
19 Other Firearms Definitions You Need To Know
The interval of time between trigger release and the detonation of the primer. Generally, the faster the lock time the better, because this makes it easier to shoot accurately.
An air gun that shoots a skirted pellet.
A cartridge with its primer located in the center of the base of the case.
A popular term for a short barreled repeating shotgun as frequently used in law enforcement and personal protection.
The bevelled portion of the rifling at the rear end of the barrel (and the forward portion of the chamber) where the bullet first engages the lands.
A black powder muzzleloading firearm action which relies upon a serpentine or S-shaped piece of metal to hold a smoldering match.
By pressing the lower end of the serpentine,
the upper end holding the burning match contacts the priming powder in the pan.
A type of firearm capable of discharging multiple individual shots in sequence, fed from a magazine, via the operation a lever, bolt, slide or some other form of manual operation.
A stout flange, invariably incorporated into the underside of the front receiver ring of a bolt action, and also frequently
incorporated into the underside of the barrel of a heavily-recoiling rifle, which when properly bedded, transfers recoil to the stock.
Any gun that can be used in a sport.
The size of the pellets in a shotgun shell.
Is a failure of the next round to completely enter the chamber. Misfeeds and failures to feed are very similar, a
failure to feed is a round that never even leaves the top of the magazine, while a misfeed is a
round that leaves the magazine but does not enter the chamber.
A type of internal safety that prevents the firing pin from moving forward for any reason unless the trigger is pulled.
A mounting point on a small arm that allows a bayonet or other accessory to be attached.
Two shots fired in rapid succession. It is different from a double tap because in a controlled pair,
the second shot will be fired after the shooter has obtained a second sight picture,
whereas in a double tap both shots are fired based upon the initial sight picture alone.
The first shot from a rifle that has been cleaned, and not fired recently may go to a different point of impact, for the same point of aim than a rifle that has been fired recently.
This first shot is referred to as a shot from a cold, clean, bore.
A term used in artillery to indicate a projectile impact beyond the designated target.
The forward portion of a bottlenecked cartridge case. Also the portion of a rifle chamber in which the neck of the cartridge case rests.