One Horse Express 10.5" 5.56 M-LOK Pistol Atrius FRS SBA3

One Horse Express 10.5" 5.56 M-LOK Pistol with Atrius FRS

The One Horse Express 10.5" 5.56 M-LOK Pistol combines a compact AR-pattern platform with a factory-installed Atrius Development Group Single-Side Forced Reset Selector (FRS). Built in the USA, the Express is designed as a complete factory-configured system rather than a collection of aftermarket components.

One Horse fits, times, and tests the selector alongside the fire-control group, gas system, bolt carrier group, and buffer system at the factory. The result is an Express configuration built around the Atrius FRS from the beginning.

Atrius Single-Side FRS

At the center of the One Horse Express is the Atrius Development Group Single-Side Forced Reset Selector. The FRS is installed as part of the factory configuration, with One Horse tuning the operating system around the complete setup.

10.5" 5.56 NATO Barrel

The Express Pistol is chambered in 5.56 NATO and uses a 10.5" medium-profile barrel with a 1:7 twist rate. The muzzle is threaded 1/2x28 and comes equipped with an A2 muzzle device.

A carbine-length gas system is paired with the compact barrel configuration.

9.25" M-LOK Handguard

This version of the One Horse Express features a 9.25" M-LOK handguard, providing mounting space for compatible accessories while maintaining the compact dimensions of the 10.5" platform.

Breek Arms Warhammer Mod2 Charging Handle

A Breek Arms Warhammer Mod2 charging handle comes installed from the factory, providing an upgraded charging handle configuration over a basic mil-spec component.

SBA3 Brace & THRiL RTG Grip

The rear of the pistol is configured with a mil-spec buffer tube and SB Tactical SBA3 pistol stabilizing brace. A THRiL RTG Rugged Tactical Grip completes the primary furniture package.

Key Features

• One Horse Express Series pistol
• Factory-installed Atrius Single-Side FRS
• Factory-fitted, timed, and tested operating system
• 5.56 NATO chambering
• 10.5" medium-profile barrel
• 1:7 twist rate
• 1/2x28 muzzle threads
• A2 muzzle device
• Carbine-length gas system
• 9.25" M-LOK handguard
• Breek Arms Warhammer Mod2 charging handle
• THRiL RTG Rugged Tactical Grip
• Mil-spec buffer tube
• SB Tactical SBA3 pistol brace
• 30-round magazine
• 7.14 lb listed weight
• Made in the USA

Specifications

What's Included

• One Horse Express 10.5" 5.56 M-LOK Pistol
• Factory-Installed Atrius Single-Side FRS
• Breek Arms Warhammer Mod2 Charging Handle
• SB Tactical SBA3 Pistol Brace
• THRiL RTG Rugged Tactical Grip
• A2 Muzzle Device
• One 30-Round Magazine
• Applicable Factory Packaging and Documentation

Why Choose the One Horse Express 10.5"?

The defining feature of the One Horse Express is that the Atrius FRS is incorporated into the firearm as part of the factory configuration. One Horse fits and tests the selector alongside the fire-control, gas, bolt carrier, and buffer systems rather than leaving the end user to assemble those components into a working combination.

Combined with the 10.5" 5.56 barrel, compact 9.25" M-LOK handguard, SBA3 brace, THRiL grip, and Warhammer Mod2 charging handle, the Express offers a purpose-built compact configuration with its major operating components selected and configured together at the factory.