FLAKE POWDER

A type of smokeless propellant in the form of thin discs or cut squares.

FLASH HIDER

A muzzle attachment designed to reduce muzzle flash. Also called Flash Suppressor.

FLASH HOLE

1. A hole pierced or drilled through the web in the primer pocket in a centerfire cartridge case. 2. The hole in the end of a battery cup primer used in shotshells.

FLASH SUPPRESSANT

A material that is added to propellant for the purpose of reducing muzzle flash.

FLAT TRAJECTORY

A relative term for minimal arching in the flight of a projectile. Generally, the faster the speed of the projectile, the flatter it’s trajectory.

FLATTENED PRIMER

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.

FLINT LOCK

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.

FLOATING CHAMBER

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