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Glossary Gun Terms Beginning G

GAPE
The degree to which the barrel(s) of a break-open gun drop down; the size of the opening space---which should be sufficient to allow for ease of loading, unloading and properly-functioning ejection. A good gape is easier to achieve on a side-by-side than an over & under where the bottom barrel is well-enclosed by the action body.

GAUGE
The bore size of a shotgun determined by the number of round lead balls of bore diameter that equals a pound.

GLOAMING SIGHT
A second, folding or pop-up front sight bead of larger than usual size, perhaps not as accurate as a normal fine bead, but easier to see in the gloaming (twilight) or dawn.

GLOBE SIGHT
A front sight assembly, primarily for target rifles, consisting of a tube, housing interchangeable beads and blades. The tube guards against imperfect aiming due to sight pictures influenced by reflections.

GRAIN
A unit of weight widely used to express the weight of bullets and of powder charges. Equal to 1/7000 pound.

GRIP SAFETY
An interlock, often found on semi-automatic handguns, which helps prevent accidental discharge while adding no perceptible inconvenience when firing the arm intentionally. By the mere act of gripping the pistol in the hand, the shooter operates the grip safety, releasing its lock on the firing mechanism.

GUN
The British restrict the term in portable arms to shotguns. Here it is properly used for rifles, shotguns, handguns and airguns, as well as cannon.

GUNPOWDER
Chemical substances of various compositions, particle sizes, shapes and colors that, on ignition, serve as a propellant. Ignited smokeless powder emits minimal quantities of smoke from a gun's muzzle; the older blackpowder emits relatively large quantities of whitish smoke.

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