One Horse OH-15 | 5.56 NATO | 7.5" | KAK Brace | 30rd AR-15 Pistol

The One Horse OH-15 Pistol (MPN: OP05) is a short-format 5.56 NATO AR-pattern pistol built around a 7.5-inch barrel and KAK brace. It keeps the standard AR control layout and detachable-magazine system in a configuration intended for buyers who prioritize compact overall dimensions.

One Horse specifies a medium-profile barrel with a 1:7 twist, carbine-length gas system, 1/2x28 muzzle threads, and A2 muzzle device. The 7-inch handguard matches the short barrel format, while a standard charging handle, Mil-Spec buffer tube, A2 grip, and 30-round magazine complete the factory setup. The platform is manufactured in the United States and follows One Horse’s established OH-15 component layout.

Key Features & Capabilities

• 7.5-Inch 5.56 NATO Barrel: Compact barrel length for a short AR-pistol configuration.
• 1:7 Twist: Supports a broad range of commonly used 5.56/.223 projectile weights.
• Carbine Gas System: Factory gas configuration for the short operating cycle.
• 1/2x28 Threaded Muzzle: Common 5.56 thread pattern with an A2 muzzle device.
• KAK Brace: Rear brace completes the compact pistol package.

The OP05 is designed for shooters who want the OH-15 platform in its shortest 5.56 configuration while retaining standard AR controls and magazine compatibility. Browse tactical pistols or shop .223 / 5.56 ammunition.