Rosco Bloodline M4 Barrel 5.56 – Various Lengths

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Rosco 5.56 (NATO) barrels are designed to meet the modern day carbine shooters requirements. This a long way from your 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. Rosco has successfully accomplished this by picking the right twist rates, gas port diameters, and barrel materials according to the barrel they are making (not a lazy blanket method). Rosco has also balanced input from their consumers and military end users in order to bring you the rifle barrel you need, not just the one they want to sell you.


  • Barrel Material – 4150 CMV
  • Barrel Caliber – 5.56
  • Barrel Profile – M4
  • Twist – 1:7
  • Barrel Thread – 1/2 x 28
  • Gas Block Size – .750
  • Gas System Length – Carbine
  • Barrel Crown – 11 Degree
  • Barrel Finish – Nitride
  • Barrel Extension Finish – Nitride

Additional information

Weight1.94 oz
Barrel Length

10.5, 11.5, 14.5, 16


5.56x45mm NATO








Rosco Manufacturing


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