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Bloodline 10.5″ M4 5.56 NATO: This Rosco 10.5″ M4 5.56 NATO Bloodline Barrel is designed to be the perfect addition to any SBR or Pistol build. ALL NFA RULES APPLY!


"Our Rosco 5.56 (NATO) barrels are designed to meet the modern day carbine shooters requirements. We are a long way from our daddy’s “Sporter” AR, and those specs just won’t cut it anymore. From properly managed dwell times for SBR’s, to running Suppressed, or setting up a balanced patrol carbine we have incorporated your needs into our engineering. We have successfully accomplished this by picking the right twist rates, gas port diameters, and barrel materials according to the barrel we are making (not a lazy blanket method). We have also balanced input from our consumers and military end users in order to bring you the product you need, not just the one we want to sell you."


CT "Other" campatible with a pinned and welded muzzle device.

Rosco Manufacturing Bloodline 10.5″ M4 5.56 NATO

  • Barrel Length 10.5″  
    Barrel Weight 19.28 Oz  
    Barrel Material 4150 CMV  
    Barrel Caliber 5.56  
    Barrel Profile





    Barrel Thread

    1/2 x 28  

    Gas Block Size


    Gas System Length

    Barrel Crown

    11 Degree

    Barrel Finish


    Barrel Extension Finish


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