Archives: Glossary

A bullet with flattened front end perpendicular to the axis.

1. A condition where the normally rounded corners of a fired primer cup are squared due to internal pressures. 2. A primer cup configuration in which the crown is flattened to alter sensitivity.

A muzzleloading firearm ignition system wherein a piece of flint is secured to the hammer in such a manner as to strike steel upon hammer release, causing sparks which ignite powder contained in the ignition system, for subsequent ignition of the main powder charge.

A system in which a rearwardly movable chamber operates the mechanism of a firearm when fired.

A design in which the forward motion of the firing-pin is unrestrained by a spring or other mechanical means.

The bottom of a box magazine. May be hinged, sliding or immovable.

A barrel with longitudinal grooves cut into the outside surface for all or some portion of the overall length.

A chamber that has longitudinal grooves.

1. See Oil-Dent. 2. Longitudinal grooves in the sidewall of a firearm chamber. 3. See Fluted Barrel.

1. A shot considerably outside the normal group on a target. 2. A shot considerably outside the normal range with regards to velocity or pressure.