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I see that this model (MK4) comes in 7.62x39. According to the description this upper should fix standard AR style lower receivers correct. — 1 Answer

by Mick, from WY, United States Asked on October 9, 2022

Name CMMG Mk4 Resolute Upper Receiver Group (4.7)
As Low As $809.99 Save Up to 15%
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Answered by Ethan, Gear Expert, from IL, United States, on October 18, 2022

The 7.62x39 CMMG Mk4 Resolute Upper Receiver Group is designed to work with Mk47 lowers and will not work with AR15(Mk4) or AR10/LR308(Mk3) lower groups.

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