The Definition of Zero
A firearm is said to be "zeroed in" when its sights have been adjusted so that the bullet will hit the center of the target
when the sights are properly aligned upon the center of the target. The farthest distance from a firearm at which the bullet's path and the point of aim coincide.
This term is also used to mean the process of insuring that the sights of a firearm are properly aligned so that where they
indicate the bullet will strike is in fact where it strikes.
19 Other Firearms Definitions You Need To Know
A long, slender, dowel-like tool used to force powder and shot down the bore of a muzzle-loading firearm.
For hand-fired guns, normally retained in some kind of receptacle attached to the gun's barrel. Carried separately for muzzle-loading cannon.
Sometimes spelled Quad Rail.
First conceived and sold by Knights Armament Company in the mid 90s when Reed Knight saw soldiers duct taping flashlights to their handguards in news footage of Panama, the quad rail has become almost a standard item found on most military rifles. Quad rails allow easy attachment of accessories which aid tactical shooters, such as lights, infrared lasers, foregrips, sling attachment points, and secondary sighting systems.
However, nowadays, any full length forearms on an AR, with or without rails may also be refered to as a Quadrail.
A Muzzleloading long gun which has a completely smooth bore and is intended to fire a single projectile rather than a collection of shot.
The person who supervises stores and distributes supplies and provisions.
A device on a firearm which, when operated, results in the hammer or striker being cocked or moved to the ready position.
Oregon Firearms Federation. OFF is a Pro-Gun rights group based in Oregon and was founded in 1998.
An external, passive safety which can be found on the face of some trigger designs (most notably found on Glock firearms).
It is intended to prevent the trigger from being pulled by objects which find their way into the trigger guard area.
A common type of iron sights in which the rear sight is an open-topped U or a V or a square-notch shape and with a
blade type front sight, in contrast to the closed circle commonly found in aperture sights.
The firing mechanism of a a muzzle-loading weapon. In breech-loading firearms, the lock is the firing mechanism and breech-sealing assembly.
The Monte Carlo comb came to rifles via shotgun stocks. It
rises well above the ordinary comb line of the stock at the
butt and tapers downward toward the point of the comb. This
raised portion of the stock lifts the face of the shooter and his
or her line of sight well above the standard elevation provided
by the classic style. However, the same amount of drop is
maintained at the buttstock. A shooter with a long neck who
often has trouble getting his or her face down far enough on
the comb of the regular stock benefits from the Monte Carlo
The setting on the sights of a firearm that controls the vertical placement and the altitude above mean sea level.
This is important for long range precision shooting because the air density changes with elevation and affects the path of the bullet.
A safety lever or button found on the outer surfaces of the firearm and is accessible to the user. Enabling the external safety should prevent accidental pulling of the trigger. However, the best safety is always you.
The proper adjustment of the various interrelated moving parts of a gun so that every operation works in proper sequence, such as that the two ejectors
of a double gun kick out the spent cases at the same instant and with the same force.
The slang term for the procedure to clear a misfeed. To clear a misfeed, tap the base of the magazine firmly to be sure it is properly seated,
rack the slide to eject an empty case or feed a new round, and assess to
be sure your target still needs shooting. If it does, pull the trigger to create the bang.
Rifling that is formed by pulling a die made with reverse image of the rifling (the 'button') down the pre-drilled bore of a firearm barrel.
The handle on a pistol. Can also refer to a vertical grip behind the trigger on a rifle.
A fouling shot is a shot fired through a clean bore, intended to leave some residue of firing and prepare the bore for more consistent performance in subsequent shots.
The first shot through a clean bore will behave differently from subsequent shots through a bore with traces of powder residue, resulting in a different point of impact.