Cartridges designed by individual inventors that have never been commercially manufactured.
A manual safety found on some bolt action rifles, usually mounted at the rear of the bolt assembly, which pivots in an arc at right angles to the bore line.
A rifle stock developed by Colonel Townsend Whelen which features a forward sloping comb and cheekpiece.
A micrometer type device found on some iron and telescopic sights which allows the shooter to make precision adjustments to the horizontal setting.
The deviation from the expected flight path of a bullet due to the forces of wind.