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The CMMG® 5.7x28mm AR Conversion Magazine holds 40 rounds of 5.7x28mm and fits in any standard AR-15 lower receiver. To use, simply attach a CMMG 5.7x28mm Radial Delayed Blowback Complete Upper Receiver to an existing AR-15 lower. Then, insert CMMG’s AR Conversion Magazine to safely feed 5.7x28mm ammunition.
PLEASE NOTE: CMMG recommends using a standard carbine buffer and action spring to reliably cycle the action in this configuration.