Letter Z

The Definition of Zero

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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


Small Bore

Generally refers to a .32 calibre or smaller firearm.

BUG

Abbreviation for 'Back Up Gun'

X-Frame

The frame designation that Smith and Wesson uses for their extra large framed revolvers like the S&W Model 500 and S&W 460XVR

Safe

A firearm is said to be on safe when its safety is engaged and off safe when it is ready to fire.

Penetration

The distance travelled by a projectile from the point where it strikes the target to the point where it stops.

Butt

The rear end of a rifle or shotgun. (The portion that rests against the shoulder.)

Casing

Also known as a Case. The envelope (container) of a cartridge. For rifles and handguns it is usually of brass or other metal; for shotguns it is usually of paper or plastic with a metal head and is more often called a "shell."

Dummy Round

An inert ammunition-shaped object, used in practice to simulate misfeeds and other malfunctions and also used in dry fire practice. Unlike a blank, a dummy round contains no charge at all. A snap-cap is a type of dummy round.

Mushroomed Bullet

A description of a bullet whose forward diameter has expanded after penetration.

EDC

Abbreviation for Every Day Carry

Iron Sights

The mechanical sighting system which usually comes with the firearm made of metal with no optics.

Throat

The beginning of the bore of a rifled firearm. The transition between the chamber and the rifling. The area most vulnerable to erosion from high velocity cartridges.

Field Gun

A shotgun, generally stocked to shoot where it is pointed and of relatively light weight because one often carries it a great distance for upland birds, the consequent recoil not being an important factor because one actually shoots it very little.

Three Rules

The NRA teaches the Three Basic Rules of Safe Gun Handling. There are additional rules, but these are the three that if any two are followed, nobody will be hurt. However, obviously, all three should always be followed.

Rule One: ALWAYS keep the gun pointed in a safe direction.
Rule Two: ALWAYS keep your finger off the trigger until ready to shoot.
Rule Three: ALWAYS keep the gun unloaded until ready to use.
The NRA established these three rules in 1871. They were created to be easy to understand and remember, ensuring the highest possible level of firearm safety.
See also The Four Rules

Rim

The edge on the base of a cartridge case which stops the progress of the case into the chamber.

Grip

The portion of the stock (on a rifle) or frame (on a pistol) gripped by the trigger hand.

AD

Abbreviation for Accidental Discharge

Trigger Lock

A locking device, usially a clable with a padlock that you put on a firearm to render it unable to be fired buy running it through the magazine well and out the ejection port.

Winchester Rim Fire

More commonly known as WRF, it is a family of rimfire cartridges designed by Winchester Repeating Arms Company

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