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Rifle or handgun?
Caliber
caliber
Caliber
Caliber
Impossible to answer without knowing if it is a rifle, handgun, shotgun and the caliber/gauge.
Rifle? Handgun? Caliber? Maker? Other markings?
Depends on the caliber, type of barrel, whether it is on a handgun or rifle, etc..
Caliber is the size designation for rifle and handgun bullets. Guage is the size designation for shotgun rounds.
Caliber
Caliber
The caliber of the firearms. This is the bore diameter given in fractions of an inch, or in millimeters. A .30 caliber rifle is about .30 inches in diameter. An 8mm rifle is about 8 mm in diameter. Shotguns use an entirely different system known as gauge.