Letter: H

A slang term for a cartridge or shotshell case.

The greatest horizontal distance between any two bullet holes on a target, normally measured center-to-center.

A notch machined into a lump used to mate with the hinge pin.

A front sight that is provided with a cover to shade it from direct light.

The distance between the head of a fully seated cartridge or shell and the face of the breech bolt when the action is in the closed position. Commonly confused with headspace.

The end of the cartridge case in which the primer or priming is inserted and the surface upon which the headstamp identification is imprinted.

The distance from the face of the closed breech of a firearm to the surface in the chamber on which the cartridge case seats. 1. BELT: A type of chamber design in which the cartridge seats in the chamber on an enlarged band ahead of the extractor groove of the cartridge body. 2. MOUTH: A type of chamber design in which the cartridge seats in the chamber on the mouth of the cartridge case. 3. RIMLESS: A type of chamber design in which the cartridge seats in the chamber on the shoulder of the cartridge case. 4. RIMMED: A type of chamber design in which the cartridge seats in the chamber on the rim or flange of the cartridge case.

A device used in a firearm to determine the distance between the breech face and the chamber surface on which the cartridge seats. Also called Breeching Plug.

Numerals, letters and symbols (or combinations) stamped into the head of a cartridge case or shotshell to identify the manufacturer, caliber or Gauge, and other additional information.

1. The part of a rifle or shotgun stock at the top of the butt end. 2. The rear portion of a bullet.