CMMG 54AFCD2 5.7 AR Conversion Mag 5.7x28mm AR-15 40rd Black Detachable 3Pack

CMMG's 5.7x28mm, 40rd 5.7 AR Conversion Magazine fits in any standard AR15 lower receiver. To use, simply attach a CMMG 5.7x28mm Radial Delayed Blowback complete upper receiver to an existing AR15 lower. Then, insert CMMGs 5.7 AR Conversion Magazine to safely feed 5.7x28mm ammunition. CMMG recommends using a standard carbine buffer and action spring to reliably cycle the action in this configuration. The 5.7 AR Conversion Magazine also retains last round bolt hold-open functionality, allowing for faster reloads. Sold in a pack of 3.