The One Horse Express Rifle in 5.56 NATO/.223 Rem (brand part no. AI01) pairs a 16-inch American-made AR-15 platform with the Atrius Forced Reset Selector, professionally fit, timed, and tested at the factory before it ever leaves the floor. One Horse builds every Express rifle in Brownstown, Indiana, and its partnership with Atrius means the selector’s three-position Safe, Semi, and Super-Semi function runs correctly out of the box instead of requiring range-day troubleshooting. A SOCOM-profile 4150 CrMoV barrel, mid-length gas system, and 7075-T6 hard-anodized receivers back up the selector with genuine mil-spec durability. Rounded out with a Breek Arms Warhammer charging handle, Thril furniture, and a 30-round magazine, this rifle suits range shooters and home-defense owners who want a duty-grade AR-15 with a forced-reset trigger group already sorted.

Key Specifications

• The chambering is 5.56 NATO/.223 Rem.
• The safety selector is a single-side Atrius Forced Reset Selector with Safe, Semi, and Super-Semi positions.
• The barrel is 16 inches, made of 4150 CrMoV steel in a SOCOM profile with a 1:8-inch twist.
• The gas system is mid-length with a .750 steel low-profile gas block.
• The receivers are 7075-T6 aluminum with a Type III hard-anodized finish.
• The handguard is a 15-inch M-LOK free-float rail.
• The bolt carrier group is M16-profile with a black nitride finish.
• The charging handle is a Breek Arms Warhammer ambidextrous design.
• The stock is a Thril CCS 6-position adjustable stock paired with an H2 buffer.
• It ships with a 30-round Thril magazine.

Frequently Asked Questions

Is the Atrius Forced Reset Selector installed and ready to run? Yes, every One Horse Express rifle ships with the Atrius FRS professionally fit, timed, and tested at the factory.

What is the Super-Semi position? It’s the FRS’s third selector position, which forces the trigger to reset after every shot for a faster, deliberate follow-up cycle without altering semi-automatic function.

Does this rifle ship to every state? It ships to a licensed FFL only, and the manufacturer restricts direct sale of this configuration in a handful of states, so confirm availability in your state before ordering.

Buy the One Horse Express Rifle

A 16-inch 5.56 NATO/.223 Rem AR-15 with a factory-tuned Atrius Forced Reset Selector already sorted is exactly what the One Horse Express delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.