One Horse OH-BR06 AR-15 10.5" .300 Blackout 1:7 Twist 5/8x24 Pistol Gas Barrel

The One Horse OH-BR06 is a 10.5" .300 Blackout AR-15 barrel engineered for compact pistol-class builds. Cut from 4150 steel with a medium profile and finished in nitride for corrosion resistance and long service life, this barrel pairs a 1:7 twist rate with a 5/8x24 muzzle thread pattern compatible with most .30-caliber muzzle devices and suppressors.

Chambered in .300 Blackout and designed around a pistol-length gas system, the OH-BR06 is well suited for short, suppressed, and SBR/pistol configurations where reliable cycling with both supersonic and subsonic loads is essential. The 1:7 twist stabilizes a wide range of bullet weights commonly used in .300 BLK, from lightweight supersonic hollow points to heavier subsonic projectiles run through a suppressor.

Whether assembling a dedicated suppressed .300 BLK pistol, stepping down from 5.56, or replacing a worn barrel, the One Horse OH-BR06 delivers a solid combination of weight, durability, and accuracy in a compact 10.5" package.