• CMMG AR 5.56 16.1" M4 4140CM SBN Barrel


    There are only 2 items left in stock.

    Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.


    M4 Profile
    4140 Chrome Moly
    Salt Bath Nitride Finish inside and out
    1:7 Twist
    5.56×45 NATO Chamber
    Threaded 1/2-28
    Carbine length gas port
    .750″ Gas Journal