BRAND NEW Ruger American Rifle - .450 Bushmaster Magazine MFG#90633, 3-round single feed magazine for the Ruger American Rifle in .450 Bushmaster. Magazine fits securely in the stock with a sleek profile. This is an original equipment manufacturer replacement or spare magazine for the Ruger American Rifle. When you choose OEM magazines, you can be assured of getting the same quality materials and attention to manufacturing as the magazines originally supplied with your firearm. If you need a spare magazine, you need this OEM Ruger American magazine.