CMMG 5.7x28mm 40 Round Conversion Magazine (3 Pack)

CMMG’s 5.7 AR Conversion Magazine allows you to easily convert your standard AR15 lower receiver to shoot 40 rounds of 5.7x28mm. Simply attach a CMMG 5.7x28mm Radial Delayed Blowback complete upper receiver to an existing AR15 lower. Then insert CMMG’s 5.7 AR Conversion Magazine to safely feed 5.7x28mm ammunition.

Please note that solely using this magazine does not convert your firearm. It is necessary to obtain the rest of the conversion parts. 

Key Features:

• Compatible with AR-15/M16 Lower Receivers
• CMMG 5.7 Upper Receiver or Bolt/Barrel Kit Required
• Designed for Radial Delayed Blowback
• Last-Round Bolt Hold-Open Functionality
• Uses standard carbine buffer and action spring