This is a CMMG 22ARC 25rd MAGAZINE and it is designed to work with CMMG conversion kits and similar Atchisson-type .22 LR conversion systems. The CMMG 22ARC 25rd MAGAZINE features a 25 Round capacity, Grey Polymer Construction, with six hex-head screws for complete disassembly. The CMMG 22ARC 25rd MAGAZINE is the same size as a curved USGI style 30 round magazine as a result feeds very reliably. Product Specifications: 25 Round Capacity magazine .22 Long Rifle Atchisson-type Conversion Systems Grey Polymer Finish Fits: ATI Kits Chiappa Kits CMMG Kits Ceiner Kits Spike’s Tactical Kits Stag Arms Kits SIG R522 & P522 Target Sports Kits Tactical Industries Kits Tactical Solution Kits Note: Does not function with Bolt Hold Open adapter