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  1. S

    CMMG MK3 barrel swap

    I purchased a CMMG MK3 mod 1 with 18" SS barrel a while back. I have never fired it but figured when I bought it I would be swapping some parts. Seems they need an adj gas block. Was looking at swapping the barrel for a JP supermatch in 20" with matched BCG and adj gas block. Rifle...
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