One Horse OH-BR04 AR-15 .300 Blackout 16" 1:7 Pistol Gas SOCOM Barrel

The One Horse OH-BR04 is a 16-inch .300 Blackout AR-15 barrel built around a pistol-length gas system and a heavy SOCOM profile. The pistol gas configuration is well suited to the .300 BLK cartridge, providing reliable cycling with both supersonic and subsonic ammunition loads.

A 1:7 twist rate stabilizes a wide range of 300 Blackout bullet weights, from lighter supersonic projectiles up through heavier subsonic rounds. The SOCOM contour adds mass at the chamber and front sight area for improved heat dissipation and rigidity, while keeping overall weight manageable for a 16-inch carbine-length build.

Finished in black and machined to standard AR-15 barrel dimensions, the One Horse OH-BR04 is a barrel option for shooters assembling a .300 Blackout rifle platform with dedicated pistol-gas tuning for the cartridge.