Black Dog 25rd Sonic X .22LR magazine (AR15 .22 fit)Compatible with all AR 15 .22s using the common CMMG/Ciener/Atchinson format mechanism, including: Atchison / Ciener conversions Bushmaster C22 CMMG Chiappa DPMS JP rifles Kriss Defiance (we recommend the Nylon Lip model) Lantac Sig Sauer 522 (the branded 522 mags were an early Black Dog design - we recommend the Nylon Lip model for 522s) Spikes Tactical Tactical Solutions Target MasterWill not fit the following rifles which have different mechanisms and magazines: Bushmaster Carbon 15.22 (old format) CZ v22 Colt/DPMS conversion kits (old format) Southern Gun Company v22 (based on the CZ v22 mechanism) Olympic Arms, Bremmer Arms and M261 conversions Smith & Wesson M&P 15-22 Tippmann Arms M4 Walther & Umarex manufactured .22 replicas (Colt M4, Colt M16, Hammerli Tac R1, HK 416, HK G36, Beretta ARX 160)