The Definition of Pattern
A shotgun term which refers to the manner in which the pellets spread out as they exit the gun.
"The pattern" refers to the overall shape of the entire set. A tight pattern is one in which the pellets are closely grouped when they land on target.
A loose pattern is one in which the pellets are widely spread.
19 Other Firearms Definitions You Need To Know
A claw [scope] mount with openings through which a shooter can use a rifle's iron sights without removing the scope.
Failure of a spent case to completely eject from a semi-automatic firearm. The case usually stands on end while lodged in the ejection port.
A double-action semi-automatic firearm which is designed to have a much lighter trigger pull than is usual for a double action.
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A shotgun barrel that has a bore diameter increased beyond standard specifications, but less than the SAAMI maximum.
Done in an attempt to reduce felt recoil, improve patterning, or change the balance of the shotgun.
The thumb-piece on the top rear of the hammer that enables it to be manually drawn back to full cock.
A cable with a padlock at the end. It is threaded through the action of the firearm rendering the gun safe and useless until the lock is removed.
A device on a firearm which, when operated, results in the hammer or striker being cocked or moved to the ready position.
Spiral grooves formed into the bore of a gun barrel, which cause the bullet to spin upon firing, thus stabilizing it much like a thrown football.
Rifling may be cut, swaged, or forged into the barrel.
An inclined, polished area on a repeating firearm, just behind the chamber, that helps guide a cartridge into the chamber when pushed forward by the closing bolt or slide.
A shooting position in which one or both knees are touching the ground and the shooter is as low as possible.
Slang word abreviation for Ammunition.
Slang for a shotgun which is set up specifically to fire a slug (a large, single projectile) rather than shot (multiple projectiles contained within a single shell).
Pulling the slide back to its rearmost position, and then letting it go forward under its own spring tension.
Racking the slide loads the chamber and prepares the gun to fire in a semi-automatic handgun.
A firearm specially designed for use underwater.
A shooting position in which one or both knees are touching the ground, but the shooter is otherwise erect.
The distance between the rear sight and the front sight. As a longer lever provides greater mechanical advantage, the greater the distance between the two sights, the more inherently accurate they will be.
The open end of the barrel from which the projectile exits.
Any malfunction that results in no shot fired when the trigger is pulled. Commonly caused by a failure to feed, bad ammunition or a broken firing pin.