One Horse Express Rifle Launches with Atrius FRS System
American firearms manufacturer One Horse has announced the launch of the One Horse Express Rifle, a full-production rifle developed in collaboration with Atrius Development Group.
The One Horse Express comes equipped with the Atrius Development Group FRS—Forced Reset Selector—professionally fit, timed, tested and tuned at the One Horse factory for out-of-the-box operation. The FRS enables three safety selector positions—Safe, Semi, and Super Semi—and is designed to integrate with standard AR fire-control groups, including Mil-Spec.
One Horse Express key features include:
- Atrius Development Group FRS (single-sided)
- THRiL RTG (Rugged Tactical Grip)
- THRiL CCS (Combat Competition Stock)
- Breek Arms Warhammer Mod2
- 16-inch CrMoV, nitride, SOCOM-profile barrel with 1:8 twist, dimpled
- 15-inch Express-Lock Handguard System with enhanced lock-up
- Low-profile, staked steel gas block, mid-length gas system
- H2 buffer system
Construction includes 7075 T6 forged aluminum receivers with standard Type III anodizing, and the fire control is a single-stage, curved unit. A 30-round THRiL magazine is also standard. It’s chambered for 5.56/.223.
The One Horse Express will be available beginning June 19, 2026—that means today.
According to Jeremy Hammons, One Horse CEO: “This rifle was built to run. The One Horse Express represents a significant step forward for One Horse and for production rifle manufacturing.
“This collaboration pairs Atrius’ selector technology with a rifle platform engineered, assembled and tuned as a complete system from day one.
“Atrius and One Horse share the same standard: disciplined manufacturing, dependable performance, and a finished product the end user can trust and be proud to own.”
“Since day one, the Atrius Forced Reset Selector has set the standard for what is possible in this industry,” said Ryan Spadafore, CEO and founder of Atrius Development Group.
“Partnering with One Horse is the kind of move that changes the conversation. They represent what we respect in American manufacturing: family ownership, precision-driven production and a commitment to performance.
“This launch is more than a new rifle. It is an example of the industry working together to move gun culture in a positive direction. We’re proud to stand alongside One Horse as we take that next step together. Together we win.”
About One Horse
One Horse is an American firearms manufacturer based in Brownstown, Indiana. The family-owned company manufactures rifles, components and firearm platforms built around practical performance, disciplined production and American manufacturing.
About Atrius Development Group
Atrius Development Group is the developer of the Atrius Forced Reset Selector, a selector system designed for multiple firearm platforms. The company works with dealers, online retailers and distribution partners across the country.
One Horse
One Horse Express
URL: theonehorse.com
