MUZZLE LOADER

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.

MUZZLE JUMP

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

MUZZLE VELOCITY

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

MUZZLE WAVE

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

MUZZLE–BREAK

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

MUSHROOM

A descriptive term for the post-impact profile of a bullet that is designed to expand upon striking a target.

MUSHROOM BULLET

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

MUSHROOMING

The act of expansion of a bullet upon impact with a target.

MUSKET

Military firearm with long barrel and fore-end or forearm extending nearly to muzzle.

MUSKET CAP

The ignition source for most military muzzle loading rifles of the Civil War era, usually consisting of a copper alloy cup containing the priming mix. They are larger than percussion caps and typically incorporate a continuous or segmented flanges (Wings) at the cup mouth for ease of handling.