One Horse OH-15 | 5.56 NATO | 10.5" | KAK Brace | MLOK | 30rd AR-15 Pistol

The One Horse OH-15 Pistol (MPN: OP01) is a 10.5-inch 5.56 NATO AR-pattern pistol configured with a KAK brace and standard OH-15 control layout. The barrel length provides a middle ground between the company’s very short 7.5-inch model and a full-length rifle while retaining compact handling and AR-platform magazine compatibility.

One Horse specifies a medium-profile barrel with a 1:8 twist, carbine-length gas system, 1/2x28 muzzle threads, and A2 muzzle device. The 9.25-inch handguard offers useful accessory space without excessive front-end length. A standard charging handle, Mil-Spec buffer tube, A2 grip, KAK brace, and one 30-round magazine complete the factory configuration. The pistol is manufactured in the United States.

Key Features & Capabilities

• 10.5-Inch 5.56 NATO Barrel: Compact AR-pistol length with more barrel than the 7.5-inch OH-15.
• 1:8 Twist: Factory twist rate for the 5.56/.223 barrel.
• Carbine Gas System: One Horse’s listed gas configuration for this pistol.
• 9.25-Inch Handguard: Provides accessory space while maintaining compact proportions.
• KAK Brace: Rear brace distinguishes this complete pistol configuration.

The OP01 is a straightforward 10.5-inch OH-15 for buyers who want a compact 5.56 platform without the Express-series FRS package. Browse tactical pistols or shop .223 / 5.56 ammunition.