Archives: Glossary

1. A metal plate fitted to the lower part of some frames through which the trigger or triggers pass. 2. A component attached to the frame or receiver of some firearms, which supports the major components of the firing mechanism and may have the trigger guard as an integral portion.

The average force which must be applied to the trigger of a firearm to cause the sear, striker, or hammer to release with the force applied approximately parallel to the bore line.

A device for measuring trigger release force.

An accessory which is attached to the trigger to give a much larger trigger-finger bearing surface.

A gradual increase of pressure on a trigger until it releases.

1. A device to prevent certain firearms from being fired until the finger lever is closed. 2. A device to prevent over-travel of the trigger.

A device to hold a telescope on a firearm.

A sight containing optical elements which magnifies the target.

The lowest temperature to which the surface of material must be raised for the combustion of the material to become self-sustaining.

1. On firearms, it is the projecting part of wood components which fit into the receiver or frame. 2. On ammunition, that portion of the rimfire bullet which fits into the cartridge case, from bullet base to bottom of band. Also called Heel. See Heel.