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Glossary Results

G - 42 matching terms

GAGE
An instrument for measuring or testing a parameter.

GAGE, CONFORMAL
A design of piezoelectric transducer system in which the sensing end matches the internal curvature of the chamber.

GAGE, HEADSPACE
See Headspace Gage.

GAGE, PRESSURE
A piston or crusher system or a piezoelectric transducer system used to measure internal chamber and/or barrel pressure in a firearm or test device.

GAGE, RADIAL PRESSURE
A British term denoting a gage to measure cartridge-developed pressure through the sidewall of a case or shotshell tube as opposed to measuring the pressure transmitted through the head.

GAGE, STAR
A measuring instrument for determining internal diameters, often used to measure the inside diameter of a gun barrel.

GAS CHECK
1. A metallic cup attached to the base of some lead alloy bullets.
2. An obturating cup used under the piston in crusher pressure testing.

GAS CHECK BULLET
See Bullet, Gas Check.

GAS CUTTING
An erosive effect in a firearm caused by the high velocity, high temperature propellant gases.

GAS OPERATED
An automatic or semiautomatic type firearm in which the propellant gases are used to unlock the breech bolt and then to complete the cycle of extraction and ejection. This is accomplished usually in conjunction with a spring which returns the operating parts to battery.

GAS PISTON
See Piston, Gas.

GAS PORT
See Port.

GAS VENT
See Vent, Gas.

GATE, LOADING
1. Revolvers: A hinged piece attached to the frame which is opened to permit loading.
2. Shoulder Arms: A spring loaded cover for the loading port.

GAUGE
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.

GILDING METAL
Metal alloys of 90 or 95 percent copper and the remainder zinc. Also termed Commercial Bronze. Neither name is recommended by Copper Development Association, Inc., but instead Alloy No. 220 and Alloy No. 210, respectively, are recommended. Used extensively for the manufacture of bullet jackets.

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

GRAIN
1. A unit of weight (avoirdupois), 7000 grains per pound.
2. The grain unit is commonly used in American an English ammunition practice to measure the weight of components.
3. A term sometimes applied to a single particle of propellant powder. More properly called a kernel.

GRIP
1. In handguns, the handle.
2. In shoulder arms, that portion of the stock to the rear of the trigger.

GRIP ADAPTER
A filler piece attached to the front of the grip of a firearm.

GRIP, BIRD’S HEAD
A handgun grip that comes to a point in front, making it resemble a bird’s head.

GRIP, PISTOL
On shoulder firearms, that part of the stock behind the trigger, shaped similar to the grip of a pistol to afford a better grasp.

GRIP, SAFETY
See Safety, Grip.

GRIP, STRAIGHT
On shoulder firearms, describes a butt stock without a pistol grip.

GROOVE DIAMETER
The major diameter in a barrel which is the diameter of a circle circumscribed by the bottom of the grooves in a rifled barrel.

GROOVE, LEAD KNIFE
A circumferential impression in a lead bullet applied forward of the mouth of the case after crimping.

GROOVES
See Rifling.

GROUP
A series of consecutive shots fired at the same aiming point without changing the sight adjustments of the firearm.

GROUP MEASUREMENT
The determination of the center-to-center distance between the two bullet holes farthest apart on a target. This is referred to as the group extreme spread. Other common measurements made are the extreme horizontal and vertical spread and the mean radius.

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 LOCK
See Lock.

GUN POWDER
A commonly used term for cartridge and muzzle loading propellant.

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

GUN, AIR
A gun that uses compressed air or gas (carbon dioxide) to propel a projectile. Projectiles in U.S. are normally 17 to 22 caliber and are either round or cup-shaped lead “pellets.” True air guns should not be confused with guns that use spring force (commonly called BB guns) to propel projectiles. Air guns are also called Air Rifles, Pellet Rifles, Pellet Guns.

GUN, BULL
A firearm built with an extra-thick, heavy barrel, used primarily for target shooting or varmint hunting.

GUN, COMBINATION
A multiple barrel firearm designed to handle different sizes, calibers, or types of ammunition.

GUN, LONG
See Shoulder Arm.

GUN, RIOT
A shotgun with a short barrel designed for riot control or guard duty.

GUN, SKEET
A shotgun designed for use in the game of Skeet. Usually made with a cylinder bore or similar type choke.

GUN, SPORTING
A firearm intended primarily for sport and recreation.

GUN, TRAP
A shotgun specifically designed for the game of Trap shooting.

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