Letter: B

A protrusion from the bolt, usually at right angles from the axis of the bolt, which is used to manually actuate the mechanism.

A mechanism of two or more pieces which is used in the alteration of bolt handles.

The forward end of the bolt containing the bolt face or breech face.

The protrusion or protrusions from the surface of the bolt body which lock into mating recesses in the receiver, barrel or barrel extension to resist rearward thrust of the chamber pressure.

Longitudinal grooves in the receiver in which the bolt lugs or other projections travel.

1. A device which allows the bolt to be removed from the firearm. 2. A device which allows the bolt to move into battery from the “hold open” position.

A component at the rear end of the bolt which guides the firing-pin and supports the firing-pin spring in bolt action rifles. Also called bolt plug.

A device which is intended to retain the bolt in the firearm during normal operation.

The distance the bolt travels from “fully open” to “fully closed” position.

1. A protective device used on the buttstock of a firearm during test firing 2.A type of recoil pad.