Letter: A

1. To charge or load a firearm. 2. Contraction of “firearm.”

A method of distinguishing various gauges of shotshells and types of metallic ammunition by color or plating.

A continuously produced batch of ammunition uniquely identified by a code. Lot size is determined by the manufacturer as part of their manufacturing process.

The angle formed between a horizontal line and the center line of the bore at the moment the projectile leaves the muzzle of the gun.

The vertical angle formed between the line of sight to the target and the axis of the barrel bore.

The ring-like space between the top of the primer and the primer pocket or battery cup on the base of a cartridge.

A fastening method of the fore-end of double barreled shotguns which utilizes a spring loaded bolt that extends beyond the tip of the fore-end. A British term.

A metallic element used to alloy lead to increase hardness. Symbol Sb.

An internal metal component in a cartridge primer assembly against which the priming mixture is pinched by the firing-pin blow. See Primer.

A form of metallic sight, front or rear, containing and aperture or disc with a hole. Also called Peep Sight, or Receiver Sight (if mounted on receiver). See Sight Aperture.