Letter: M

Firearm which can only be loaded with powder and projectile(s) through the muzzle or front end of a cylinder in the case of a muzzleloading revolver.

An electrical or optical device which signals the passage of shot or a projectile at the muzzle of a firearm.

The air that is compressed and moves out radially from the muzzle of a firearm after firing a projectile.

The velocity of a projectile as it exits the muzzle of a firearm.

The generally upward motion of the muzzle of a firearm which occurs upon firing.

A bullet that has expanded upon impact into a mushroom-like shape.

A visual phenomenon that appears to displace a target from its true position through a shimmering effect. It is caused by heated air that deflects light rays.

Any malfunction during the feed cycle of a repeating firearm resulting in the failure of a cartridge or shell to enter the chamber completely. Also known as Failure to Feed.

A failure of the priming mixture to be initiated after the primer has been struck an adequate blow by a firing-pin or the failure of the initiated primer to ignite the powder.

The solid section at the breech end of some multi-barrel guns into which the barrels are inserted.