Letter Z Firearms Glossary
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.
The act of setting up a telescopic or other sighting system so that the point of impact of a bullet matches the sights at a specified distance.
18 Other Firearms Definitions You Need To Know
A slang term for a revolver that holds siz rounds. Usually referring to cowboy style revolvers.
A second sear, poised just behind a second notch in the hammer. It is possible that when a cocked firearm is dropped or sharply jarred, a
single sear could jump out of its notch and the hammer could fall, firing the gun accidentally. In this event, an intercepting sear
would engage before the hammer could fall completely, preventing an accidental discharge. On a gun with intercepting sears, only
by pulling the trigger are both sears moved out of the way simultaneously, allowing the gun to fire.
Intercepting sears are usually found on better sidelock actions. They are sometimes found on best boxlocks,
and can be recognized by an extra screw behind the action fences, in addition to the usual two screws (or pins) along the lower rear of the receiver.
A laser sight is an alternative sighting device which enables the shooter to quickly and accurately see where the firearm is aimed even
when lighting or other conditions prevent using the gun's normal sights. Lasers may be located within the grips,
hung from accessory rails at the front end of the gun, or placed within the firearm.
The hinged cover over the opening through which cartridges are inserted into the magazine.
An air gun that shoots a skirted pellet.
The amount of work done by a bullet, expressed in foot pounds.
The wearing of the portion of the barrel where the gas pressure and heat is highest as the projectile leaves the chamber.
The greater the chamber pressure the more rapid throat erosion occurs which is compounded by rapid firing which heats and weakens the steel.
The recoil spring is the powerful spring that cushions the slide in its rearward travel and then sends the slide forward again with enough force to drive the fresh round firmly into the chamber.
The strength of the recoil spring is calibrated to run the slide without any outside assistance.
A rifle with a relatively short barrel.
A type of cartridge whose bullet diameter is substantially less than the body diameter of the casing.
A shoulder-fired long gun which has a rifled barrel.
A device used to determine the range to a target. Many range finders work by bouncing a laser beam off the target or
nearby object and measuring the time for the reflection to arrive back at the instrument.
It is also possible to use various passive optical devices such as a mil-dot telescopic sight.
A premature, unintended discharge of a firearm that occurs as a round is being loaded into the chamber.
A specialized firearm used underwater that is fired when in direct contact with the target.
A type of firearm in which the action is closed, with a cartridge in the chamber prior to firing. When the trigger is pressed the cartridge is fired,
and the action cycles loading another cartridge into chamber and when firing is stopped the bolt remains closed and the chamber remains loaded.
A unit of weight widely used to express the weight of bullets and of powder charges. Equal to 1/7000 pound.
A firearm loaded through the breech.
Helical grooves in the barrel of a gun or firearm, which imparts a spin to a projectile around its long axis.
This spin serves to gyroscopically stabilize the projectile, improving its aerodynamic stability and accuracy.