Rosco 10.5″ M4 5.56 NATO Bloodline Barrel


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!

(1 customer review)

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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.

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


Additional information

Weight 2.3 lbs
Dimensions 20 × 3 × 3 in

1 review for Rosco 10.5″ M4 5.56 NATO Bloodline Barrel

  1. ksjeep85 (verified owner)

    A great barrel from a great barrel manufacturer. Fit and finish is excellent and based on my other Rosco barrels I’m sure that accuracy and performance will be just as expected from Rosco.

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