CMMG 5.7x28mm AR-15 10-Round Conversion Magazine

Compatible with any standard AR-15 lower receiver (not included), the CMMG® 5.7x28mm AR-15 10-Round Conversion Magazine safely feeds 5.7x28mm ammunition for reliable operation with your CMMG 5.7x28mm Radial Delayed Blowback complete upper receiver (not included). Constructed of durable, high-impact polymer, this magazine features a last round bolt hold-open functionality for clear indication of an empty magazine and faster reloads.