One Horse, a family-owned rifle maker in Brownstown, Indiana, started shipping the Express Rifle this month in collaboration with Atrius Development Group — marking the first production AR-15 to arrive from the factory with a forced reset selector installed and function-tested out of the box. AmmoLand covered the launch on June 28, reporting that initial units are clearing to FFLs in states where forced reset selectors are legal, with a shipping deadline of July 4 on the launch-price inventory.

The Atrius Forced Reset Selector is a three-position mechanism — Safe, Semi, and what Atrius calls "Super Semi." In the third position, the selector uses the mechanical energy of the AR's operating cycle to accelerate the trigger's reset, allowing the shooter to fire faster follow-up shots while remaining in semi-automatic territory. Each shot in "Super Semi" still requires a discrete trigger pull; the selector speeds up how fast the trigger is ready for the next one. Legality varies by state, and One Horse ships only to FFLs in jurisdictions that permit the technology.

The critical design decision One Horse made was to engineer the Express around the Atrius selector from the start rather than retrofit an existing lower. The company cut the trigger shelf and specified an H2 buffer weight to ensure the mechanism cycles reliably from the first magazine. That tuning work is typically the most frustrating part of a DIY forced reset build — the wrong buffer weight or shelf geometry can turn a $200 selector into an unreliable paperweight. One Horse absorbs that engineering work into the $999.99 launch price.

The rest of the package is a solid duty-grade AR: a 16-inch SOCOM-profile barrel in 5.56 NATO with a 1:8 twist and mid-length gas system, a 15-inch free-float M-LOK handguard on a 7075-T6 aluminum upper and lower in Type III hard anodize, an M16-profile black-nitrided bolt carrier group, and a Breek Arms Warhammer Mod2 charging handle. Stock and pistol grip are from THRiL's CCS line. The rifle ships with one 30-round magazine and weighs 7.14 lbs.

The $999.99 launch price represents a steep discount from the $1,199.99 standard MSRP. By comparison, Rifle Configurator calculated that a comparable component build — a base AR plus the Atrius selector at its $199 standalone price plus buffer and shelf modification — runs $1,100 to $1,400 before any gunsmithing labor. One Horse's factory-tuned package saves money and eliminates the trial-and-error.

Production is limited for the launch-price run, and One Horse is fulfilling orders only through dealers in FRS-legal states. Buyers in qualifying states can order through One Horse's dealer network or direct through the company's online storefront for FFL transfer. The rifle lands in a growing segment of the market where shooters want more from their semi-automatic platform and don't want to spend months debugging a home build to get there. As demand for factory-ready advanced fire control builds grows, the One Horse and Atrius collaboration may set a template for what buyers expect from a production AR at this price point.