Rosco Pb Bbl 10.5" 300blk Hb 1/7

The Rosco Pb Bbl 10.5" 300blk Hb 1/7 is a precision rifle barrel engineered for subsonic and supersonic .300 Blackout performance in short-barreled rifle (SBR) configurations. This 10.5-inch barrel delivers the compact profile demanded by tactical operators, home defenders, and precision shooters who require a versatile intermediate cartridge solution without sacrificing accuracy. Rosco Manufacturing's reputation for quality metallurgy ensures consistent chamber tolerances and superior shot-to-shot repeatability, making this barrel ideal for suppressed or unsuppressed applications.

Built from high-quality steel with a heavy profile construction, the Rosco Pb Bbl 10.5" 300blk Hb 1/7 features a 1-in-7 twist rate optimized for stabilizing heavier .300 Blackout projectiles (125–220+ grains), which is critical for subsonic ammunition accuracy and terminal performance. The 10.5-inch length balances velocity retention with maneuverability, producing adequate power for both hunting and defensive use while remaining controllable in tight spaces. Rosco's precision button-rifled barrel processes eliminate stress risers and ensure uniform rifling geometry, reducing copper fouling and extending barrel life. The heavy profile minimizes harmonic deflection and thermal drift during sustained fire, supporting sub-MOA accuracy when paired with quality optics and ammunition.

This barrel fits AR-15 platform receivers and is compatible with standard .300 Blackout bolt carrier groups and magazines. Shooters building short-barreled rifles for suppressed fire, home defense, or tactical training benefit most from the compact handling and proven Rosco build quality. Installation requires basic gunsmithing knowledge or professional armorer assistance; a appropriately torqued barrel extension and proper headspace verification are essential for safety and reliability. Weighing 2.06 lbs, the heavy profile adds minimal overall system weight while substantially improving accuracy and recoil management compared to pencil-profile alternatives.