One Horse Express | 5.56 NATO | 10.5" | FRS | Quad | 30rd AR-15 Pistol

The One Horse Express Quad Rail Pistol (MPN: APQ01) is the rail-forward version of the company’s compact 10.5-inch 5.56 NATO Express platform. It is built around the Atrius Forced Reset Selector as a complete factory system, with the selector, gas system, bolt-carrier interface, buffer setup, and receiver components configured together before the firearm leaves One Horse.

The pistol uses a 10.5-inch medium-profile barrel with a 1:7 twist, carbine-length gas system, 1/2x28 muzzle threads, and A2 muzzle device. The Express quad-rail handguard gives the pistol a traditional four-sided accessory interface, while a Breek Warhammer Mod2 charging handle, THRiL RTG grip, SB Tactical brace, and one 30-round magazine complete the package.

Key Features & Capabilities

• Atrius FRS Equipped: Selector is installed as part of the complete factory-configured Express system.
• 10.5-Inch 5.56 Barrel: 1:7 twist and carbine-length gas system.
• Quad-Rail Handguard: Traditional four-sided accessory mounting distinguishes APQ01 from the M-LOK Express.
• Breek Warhammer Mod2: Ambidextrous charging handle included from the factory.
• 30-Round Magazine: Standard AR-pattern magazine supplied with the pistol.

The APQ01 is the Express option for buyers who prefer a quad-rail interface over M-LOK while keeping the same compact FRS-equipped concept. Browse tactical pistols or shop .223 / 5.56 ammunition.