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Will this upper work on a mil spec lower reciever ? — 1 Answer

by Robbie Ladner, from WY, United States Asked on September 10, 2024

Name CMMG Mk4 5.7X28mm Resolute Upper Group Receiver (5)
As Low As $909.99 Save Up to 13%
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Answered by Juice, member, from LA, United States, on January 05, 2025

Yes it is a mk4 so you’ll need the cmmg 5.7x28 AR compatible magazines

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