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Glossary Gun Terms Beginning I thru J

IMPORTS
Information for foreign sellers and for Americans purchasing firearms abroad.

“IMPROVED” CARTRIDGE
A derivative version of a basic cartridge, typically whose shoulders have been expanded outward and forward for increased powder capacity for use in a rifle whose chamber has been enlarged accordingly.

INLETTED SWIVEL STUDES
A type of base for detachable sling swivels whereby the steel base is inletted into the stock for a cleaner look, rather than simply being screwed onto the surface. A sign of a better custom-made rifle.

INLETTING
The process of carving out recesses in wooden stocks with precision, using gouges, chisels and scrapers to accept the steel components of a firearm.

IRON SIGHTS
A set of two metallic protuberences fitted normally to the top of a firearm; one near the muzzle and the other near the breech, which when adjusted and aligned properly with the target, aid in the placing of the projectile in the desired location.

J-BORE
In reference to variations of the German military cartridge, 8x57.

JACKET
The envelope enclosing the core of a bullet.

JONES UNDERLEVER
A lever, mounted to the underside of the receiver of a break-open gun, extending half way around the trigger guard and ending in a knob the shooter can grasp. When the lever is turned 90 degrees to the right, a pair of tapered, opposing lugs move out of mating bites in the barrel lumps, allowing the barrels to drop open on the hingepin.

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