Atrius Development and One Horse Launch First Factory-Equipped FRS Rifle
Atrius Development and One Horse have collaborated on the One Horse Express, the first production rifle to come factory-equipped with the Atrius Force Reset Selector (FRS). Atrius Development is a well-known and emerging firearms parts manufacturer specializing in force reset technology, while One Horse is a small rifle manufacturer based in Brownsville, Indiana, focused on producing affordable, high-quality rifles at a reasonable price point.
The partnership represents a strategic opportunity for both companies. Atrius gains a factory-built rifle specifically tuned to run its FRS system, while One Horse benefits from increased industry exposure and a unique product offering. More importantly, the collaboration could encourage additional rifle manufacturers to begin offering factory-installed and properly tuned FRS or FRT-equipped rifles, removing much of the guesswork often associated with aftermarket installations.
One Horse Express Features
Upper Receiver
- Forged One Horse upper receiver
- Mil-spec bolt carrier group
- Breek Arms Warhammer Mod 2 charging handle
- 16-inch SOCOM-profile barrel
- 15-inch M-LOK handguard
- A2 flash hider
Lower Receiver
- Forged One Horse lower receiver
- Single-stage trigger
- Atrius Force Reset Selector (FRS)
- Mil-spec buffer tube with H2 buffer and recoil spring
- Thrill pistol grip and buttstock
Below is the official press release from Atrius Development regarding the release of the One Horse Express rifle.
Press Release
AUSTIN, TEXAS — Atrius Development Group, the veteran-owned American firearm technology company behind the Atrius Forced Reset Selector (FRS), today announced its first OEM partnership with One Horse, a veteran-founded rifle manufacturer known for its commitment to American craftsmanship and precision manufacturing.
Under the agreement, select One Horse rifle platforms will ship factory-equipped with the Atrius Forced Reset Selector, marking a significant business milestone for Atrius as its flagship technology transitions from an aftermarket product to a factory-installed component on complete production rifles.
The partnership represents an important step in Atrius Development Group’s growth strategy and reflects increasing demand for innovative firearm technologies built and manufactured in the United States. For emerging technology companies, OEM adoption is widely recognized as one of the strongest validations of a product’s market acceptance. By integrating the Atrius Forced Reset Selector into select rifle configurations, One Horse is providing consumers direct access to the technology through established manufacturing and distribution channels.
“This partnership represents a defining moment for Atrius,” said Ryan Spadafore, CoFounder and Chief Executive Officer of Atrius Development Group. “OEM adoption is one of the strongest validations a technology company can receive because it demonstrates confidence from a respected manufacturer and brings innovation directly to consumers at scale. We are proud to partner with One Horse, a company that shares our commitment to American manufacturing, quality craftsmanship, and delivering products that reflect the values of responsible firearm ownership.”
Founded by U.S. Army veteran Jeremy Hammons, One Horse was established with a mission to produce dependable, American-made rifles without compromise. Drawing on more than a decade of industry experience, the company has earned a reputation for quality manufacturing, precision assembly, and reliability.
“From day one, our mission has been to build rifles that Americans can trust,” said Jeremy Hammons, Founder of One Horse. “Atrius has developed a technology that aligns with our standards for innovation, reliability, and performance. Integrating the Forced Reset Selector into select factory configurations allows us to continue pushing the platform forward while staying true to our commitment to quality.”
The Atrius Forced Reset Selector is a three-position selector engineered for AR-15 platforms, allowing users to select between Safe, Semi, and Super Semi modes. Designed for compatibility with standard AR-15 fire control groups, the technology has gained recognition among firearm enthusiasts for its performance, reliability, and ease of integration.
While the firearm industry has experienced significant innovation in recent years, factory adoption remains a critical benchmark for emerging technologies. The Atrius-One Horse partnership signals a broader shift toward manufacturer integration and highlights the growing role of technology-driven companies within the firearms sector.
Both companies are veteran-led and committed to American manufacturing. Every One Horse rifle is assembled in the United States, and Atrius continues to focus on domestic engineering, product development, and production as it expands its footprint within the firearms market. The agreement is expected to strengthen distribution opportunities for both companies while introducing Atrius technology to a broader consumer audience through factory-equipped rifle offerings. As Atrius continues to scale operations, the company views OEM partnerships as a key component of its long-term growth strategy and its mission to advance innovation within the modern sporting rifle platform.
About One Horse
One Horse is a veteran-founded, American-made rifle manufacturer committed to producing dependable firearms without compromise. Founded by U.S. Army veteran Jeremy Hammons, the company builds every rifle with a relentless focus on quality, precision, and reliability. By combining modern manufacturing techniques with hands-on craftsmanship, One Horse delivers purpose-built rifles trusted by firearm enthusiasts and responsible American gun owners nationwide.
Closing Thoughts
The One Horse Express represents an important milestone for both Atrius Development and the broader force reset market. For years, enthusiasts interested in force reset systems often found themselves experimenting with buffers, springs, gas systems, and other components to achieve reliable performance. A factory-built rifle designed and tuned around the Atrius FRS removes much of that complexity and lowers the barrier to entry for consumers interested in the technology.
Whether this partnership becomes the first of many OEM relationships remains to be seen, but it is a significant step forward for Atrius as its technology moves from the aftermarket space into complete factory rifle offerings. The One Horse Express is available now with an MSRP of $999, offering consumers an accessible entry point into a rifle platform purpose-built around the Atrius Force Reset Selector.
