ROSCO BL BBL 10.5″ 5.56 1/7

The Rosco 10.5″ M4 5.56 NATO Bloodline Barrel delivers performance built specifically for SBR and pistol builds. ALL NFA RULES APPLY. Rosco 5.56 (NATO) barrels are engineered to meet the demands of modern carbine shooters. Rosco barrels represent a departure from conventional AR designs, with specifications tailored to contemporary requirements. Whether managing dwell times in short-barreled configurations, running suppressed, or assembling a balanced patrol carbine, Rosco addresses these operational needs through deliberate design choices. The barrel achieves this through careful selection of twist rates, gas port sizes, and barrel materials specific to each application.