While the internal diameter of the handgun or rifle barrel is usually measured by caliber, shotguns are generally calculated by gauge. We use cookies to give you the best possible encounter. You could learn more with regard to the cookies we use and why we make use of them https://benelli-super-black-eagle13469.digiblogbox.com/45071537/facts-about-benelli-m4-tactical-12-gauge-semi-automatic-shotgun-18-5-barrel-phosphate-and-black-pistol-grip-revealed