SBR is one of the few manufacturers to offer loaded ammunition for the 375 SOCOM round, offering several different and potent loads for practice, hunting or defense. Like the .458 SOCOM, the 375 SOCOM cartridge was developed specifically for the AR-15 family of gas-operated, detachable-box magazine-fed firearms. Overall loaded length is similar to the ubiquitous 7.62 x 39 M43 and .223 Remington, and standard .223 caliber AR-15 magazines will accept a limited number of 375 SOCOM cartridges. The standard .223 lower receiver for the AR-15 can be used without modification, and the rifle will function in both semi and full automatic modes. Sierra GameKing Bullets are designed for hunting at long range, where their extra margin of performance can make the critical difference. GameKing bullets feature a boat tail design to bring hunters the ballistic advantage normally found with match target bullets. This bullet features high ballistic energy downrange and exceptional accuracy. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.