I did, however, upgrade the lower parts set to the CMMG ZEROED Gunbuilder's Kit. For about $30 to $40 more than the company's standard kits, customers get an ambidextrous magazine release ...

Established in 2002, CMMG continues ... the Barrel and BCG Kit converts the conventional gas-operated AR-15 action. The adaptation is relatively simple and requires fewer parts than Stoner's ...