One Horse OH-BR03 AR-15 5.56 NATO 16" SOCOM Profile Mid-Length Barrel

The One Horse OH-BR03 is a 16-inch AR-15 barrel chambered in 5.56 NATO, machined with a SOCOM profile and paired with a mid-length gas system for reliable cycling and a softer recoil impulse than a carbine-length setup.

Built by One Horse LLC from steel, the OH-BR03 uses the stepped SOCOM contour - thicker through the chamber and under the handguard, then stepping down toward the muzzle - for a balance of rigidity and manageable weight in a general-purpose carbine.

The OH-BR03 is intended as a drop-in barrel for a new AR-15 build or as a direct replacement upgrade on an existing AR-15 upper. The combination of a 16-inch SOCOM-profile barrel and mid-length gas tuning is a popular configuration for 5.56 NATO carbines aimed at balancing accuracy, longevity, and shootability.