Answers for will this work with a 5.56 NATO upper

CMMG, Inc 22LR AR Conversion Kit, Mk57, w/ 3 Magazines, 10rd

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Answered by Dustcommander100, member, from SC, United States, on July 19, 2021

Per the CMMG website, the Mk57 works with the 5.7X28MM Conversion upper receiver only - not the 5.56 or .223 chambered rifles. For all the details, check out the info at CMMG.com. The info is a bit cryptic and takes time to understand.

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will this work with a 5.56 NATO upper — 1 Answer