GUN ROOM

A room that is maintained for the purpose of keeping guns in storage, on display, or for repair.

GUARD SCREW

A screw that extends from the trigger guard into and through the stock.

GUN COTTON

Nitrated cellulose (either cotton linters, wood pulp or a mixture of the two) which is used for the manufacture of smokeless propellant. Chemical name – nitrocellulose.

GUN POWDER

A commonly used term for cartridge and muzzle loading propellant.

GAS PORT

An opening in the wall of a barrel or chamber to allow the redirection of propellant gas. Usually associated with gas-operated actions or other mechanisms.

GAS VENT

1. Any hole in the action of a firearm to allow the escape of gases from the breech. 2. A hole in the gas cylinder of a firearm to bleed off gas. 3. Ammunition: See Flash Hole. 4. See Barrel Vent.

GAUGE

1. A term used in the identification of most shotgun bores. (410 bore is an exception.) It is related to the number of bore diameter lead balls weighing one pound. 2. An instrument for measuring or testing a parameter.

GILDING METAL

A copper alloy with a nominal composition of 95 percent copper and 5 percent zinc. “Gilding Metal” is the trade name for the Copper Development Association, Inc. Alloy C21000. It is extensively, but not exclusively used in the manufacture of bullet jackets. See also “Commercial Bronze.”

GLASS BEDDING

The application of a mixture of fiberglass and resin between the action and/or barrel and stock.

GLOBE FRONT SIGHT

A form of front sight usually used on target rifles generally cylindrical in shape and arranged to accept various inserts containing either rings or posts.