SBR is a manufacturer of small arms ammunition specializing in precision training, match, hunting & duty cartridges. They are the leading manufacturer of 458 SOCOM, 375 SOCOM, 240 Spectre and 338 Spectre ammunition. Their precision tactical line of ammunition is designed with the law enforcement officer and warfighter in mind. Extensive military and competition shooting experience goes into every round loaded. In addition to ammunition, SBR produces a high quality barrels such as the AR-15 Pistol Barrel chambered in 338 Spectre. Perfect for a new AR-15 build focused on the versatility of the 338 spectre for single shot shooting and small game hunting.