Home CMMG CMMG MK57; FN 5.7x28mm AR Upper #shorts #mk57 #fiveseven #fn57

CMMG MK57; FN 5.7x28mm AR Upper #shorts #mk57 #fiveseven #fn57

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I love the RDB action of the MK57. #fiveseven #fn57 #57x28mm #Mk57

@CMMG
@YHMachineCo

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