Letter O

The Definition of Open Frame

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Open Frame

Refers to a revolver frame that has no top-strap over the cylinder.


19 Other Firearms Definitions You Need To Know


Cross Dominant

This means a shooter who is right-handed but left-eyed, or left-handed and right-eyed.

FFL

Abbreviation for Federal Firearms [Dealer's] License.

Folding Stock

A long gun stock that may be doubled over for conveniently compact storage.

Live Fire Exercise

Any exercise in which a realistic scenario for the use of specific equipment is simulated. In the popular lexicon this is applied primarily to tests of weapons or weapon systems that are associated with the various branches of a nation's armed forces, although the term can be applied to the civilian arena as well.

Ejection Port

The opening through which the empty, spent ammunition case is ejected from of a firearm.

Cape Gun

A two-barreled, side-by-side, shoulder-fired gun having one smoothbore shotgun barrel and one rifled barrel.

Three Gun

A shooting sport where cometitors use three different guns on each stage of the competion; shotgun, rifle and handgun.

Touchmark

A craftsman's signature stamp, discretely placed to identify his work.

Reset Point

The point of the trigger's return at which the gun's internal mechanisms are ready to fire another round.

Primer Ring

Refers to a visible dark ring created by the primers in centerfire ammunition around the firing pin hole in the frame after much use.

Trapdoor

As in Trapdoor buttplate or Trapdoor Pistol Grip Cap, one of these articles of furniture including a hinged plate, covering a small compartment below in which may be stored several extra cartridges, sight bits, extra springs or pins, cleaning rod, etc.

BB

A type of steel round shot fired from air rifles. The name originated from the size of steel balls used in a shotgun of the same size (.177 caliber). In a 12 guage shotgun shell using BB size shot, there will be typically 90 BBs in a shell

Point of Impact

The point where the projectile from a firearm hits.

Long Rifle

Typically used in the .22 caliber cartridge designation .22 Long Rifle, which is abbreviated .22LR.

Bluing

Also spelled blueing. A passivation process in which steel is partially protected against rust, and is named after the blue-black appearance of the resulting protective finish. True gun bluing is an electrochemical conversion coating resulting from an oxidizing chemical reaction with iron on the surface selectively forming magnetite (Fe3O4), the black oxide of iron, which occupies the same volume as metallic iron. Bluing is most commonly used by gun manufacturers, gunsmiths and gun owners to improve the cosmetic appearance of, and provide a measure of corrosion resistance to, their firearms.

HMR

Abbreviation for Hornady Magnum Rimfire.

WCF

Abbreviation for Winchester Centerfire.

Factory Ammo

Ammunition that has been assembled by a commercial vendor of ammunition and sold in retail stores. This is as opposed to Hand loads which have been assembled by individuals and are not typically sold.

Concealed

Hidden from view. A handgun is concealed when it is carried in such a manner that is unseen.

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