FORCING CONE

1. The tapered leade from the shotgun chamber diameter to the bore diameter. 2. The tapered leade from the bore diameter to the choke diameter. 3. The tapered entrance to the bore in the rear of a revolver barrel.

FORE-END LUG

A protrusion found on the bottom of the barrel(s) (or lower barrel in over/under firearms) that serves as the attachment point of the fore-end. Typically associated with top-break action firearms.

FRANGIBLE PROJECTILE

Originally designed for law enforcement training, frangible ammunition’s projectile is designed to break up upon impact with hardened (e.g. AR500) steel into fragments small enough to prevent injury from ricochet/splash-back at typical practice distances. Ammunition loaded with frangible projectiles is sometimes referred to as “Reduced Hazard.”

FREE BORE

A portion of the chamber, usually cylindrical, forward of the casemouth of a diameter larger than the projectile in which rifling is not present. See Bullet Jump. See Throat.