One Horse OH-15 | 300 Blackout | 16" | 15" M-LOK | 30rd Rifle

The One Horse OH-15 (MPN: OH-OG04) is the .300 Blackout rifle in the OH-15 family, combining a 16-inch SOCOM-profile barrel with a pistol-length gas system and 15-inch M-LOK handguard. The configuration keeps the familiar AR-15 layout while offering the larger .30-caliber bore and cartridge flexibility associated with .300 BLK.

One Horse specifies a 1:8 twist rate, 5/8x24 muzzle threads, A2-style muzzle device, standard charging handle, mil-spec buffer tube, A2 grip, and six-position One Horse M4 stock. The full-length M-LOK handguard provides accessory mounting space, while the top rail gives the rifle an optic-ready mounting surface. One 30-round magazine is included and listed product weight is approximately 7.14 pounds.

Key Features & Capabilities

• 16-Inch .300 Blackout Barrel: SOCOM-profile barrel with 1:8 twist.
• Pistol-Length Gas System: Factory gas configuration specified for this .300 BLK model.
• 5/8x24 Muzzle Threads: Standard thread pattern for many .30-caliber muzzle devices.
• 15-Inch M-LOK Handguard: Long free-float-style accessory mounting surface.
• Adjustable M4 Stock: Six-position stock on a mil-spec buffer tube.

OHOG04 is the One Horse option for buyers specifically looking for a 16-inch .300 Blackout AR-style rifle rather than the 5.56 OHOG01 or OHOG02. Browse AR-15 rifles or shop ammunition at Recoil Gunworks.