A 15 Round 22 Magnum Magazine for Ruger Precision rimfire rifles.The 15-round BX-15 Magnum magazine incorporates technologies that have made the 22LR BX magazines famous and also features the same feed lip geometry that has proven reliable in the 9-round, JMX-1 rotary magazine.Features Compatible with the Ruger Precision Rimfire chambered in .17 HMR and .22 WMR, Ruger 77/17, Ruger 77/22 and Ruger American Rimfire rifles chambered in .17 HMR and .22 WMR The stainless steel feed lips and \