CMMGs 5.7 AR Conversion Magazine holds 40 rounds of 5.7x28mm and 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. - TECH SPECS: - CALIBER: 5.7x28mm - CAPACITY: 40 rounds - WEIGHT: 8oz(unloaded) each
Determined at checkout.