The 15-round BX-15(R) Magnum magazine incorporates technologies that have made the .22 LR BX-15(R) and BX-25(R) magazines famous and also features the same feed lip geometry that has proven reliable in the 9-round, JMX-1 rotary magazine. The BX-15(R) Magnum is compatible with the Ruger Precision(R) Rimfire chambered in .17 HMR and .22 WMR, Ruger 77/17(R), Ruger 77/22(R) and Ruger American(R) Rimfire rifles chambered in .17 HMR and .22 WMR. The stainless steel feed lips and "constant force" spring combine with a high-lubricity, polyacetal, anti-tilt follower and durable, glass-filled nylon magazine body to make the BX-15(R) magazine rugged, reliable and easy to clean. | Ruger Magazine 15 Round BX-15 Magnum