This genuine Ruger factory magazine with Ruger logo has been tested and has proven to feed as reliably as the standard BX-1 10-round Ruger rotary magazine. BX-15 magazines will work with any factory original 10/22 Rifle SR-22 Rifle 22 Charger Pistol .22 LR Ruger American Rimfire Rifle and .22 LR Ruger 77/22 Rifle.