“The One Horse,” or simply One Horse, who we had on the podcast earlier last month, is bringing its Express Series down to pistol length with two new 10.5-inch 5.56 models, the Express Pistol MLOK and Express Pistol Quad Rail. Both carry over the same factory-installed Atrius Forced Reset Selector setup that defined the original 16-inch Express Rifle, which matters more than it sounds. An FRS is a drop-in part on paper, but if you’ve ever tinkered with one as I have in a number of different rifles, “timing” or tuning it correctly against the buffer weight, gas system, and shelf geometry is where a lot of DIY installs go sideways. One Horse is fitting, timing, and testing the whole system- selector, fire control group, gas system, BCG, and buffer- at the factory before it ships, rather than leaving that process to the end user, which can often be a frustrating lesson in tolerance stacking. More FRS News @ TFB: TFB Behind the Gun #226: Jeremy & Drew of One Horse TFB Behind the Gun #209: Ryan w/ Atrius Development Group [SHOT 2026] FRT90 Forced Reset Trigger for PS90 from Armory of Kings KAK Industries DBC Bolt Carrier For Forced Reset Triggers The One Horse Adds Two Factory-Tuned FRS Pistols to Express LineThe One Horse Express Pistols (MLOK and Quad Rail) bring Atrius Development Group’s Forced Reset Selector to compact, purpose-built 5.56 platformsBROWNSTOWN, Ind., July 30, 2026 — One Horse today announced the expansion of the One Horse Express Series with two factory-tuned 10.5-inch pistols chambered in 5.56 NATO. The Express Pistol MLOK and Express Pistol Quad Rail carry the factory-installed, factory-tuned approach introduced with the original 16-inch One Horse Express Rifle into a compact platform.Both models will debut July 30 during GOALS Range Day, the media and industry live-fire event held ahead of Gun Owners of America’s Gun Owners Advocacy and Leadership Summit, or GOALS, in Des Moines, Iowa. The summit runs Aug. 1-2 at the Iowa Events Center and One Horse is Booth #3142.The original Express Rifle debuted June 19 as the first factory-built production rifle equipped with Atrius Development Group’s Forced Reset Selector. The new pistols carry that same system-level approach into a shorter platform. Each pistol is assembled, fitted, timed and tested at the factory so the selector, fire control group, gas system, bolt carrier group and buffer system work together as a complete package.“The Express Series has grown fast because customers have seen what ‘Built to Run’ means: a rifle that’s tuned, tested and ready to work right out of the box,” said Jeremy Hammons, CEO of One Horse. “Adding the 10.5-inch pistols was the next logical step. We didn’t just shorten the platform — we carried over the same factory fitting and timing process that made the original Express Rifle what it is. Shorter platform, same standard, same reliability.”Customers can choose between two Express Lock handguard and brace configurations:Express Pistol MLOK: A 9.25-inch M-LOK Express Lock Handguard with M-LOK mounting compatibility on seven sides, two quick-detach sling points and an SB Tactical SBA3 pistol stabilizing brace.Express Pistol Quad Rail: A 9.5-inch quad-rail Express Lock Handguard with four sides of 1913 Picatinny rail, cooling and lightening cuts throughout and an SB Tactical SBA5 pistol stabilizing brace.Both models use a carbine-length gas system with a low-profile steel gas block that is dimpled and staked. Shared features include:Atrius Development Group Single-Side Forced Reset SelectorPolished and tuned mil-spec fire control groupBreek Arms Warhammer Mod2 ambidextrous charging handleM16-profile bolt carrier group that is MPI (magnetic particle inspected)Buffer system weighted and tuned for the complete operating systemTHRiL RTG pistol grip At checkout, customers can select an ambidextrous Atrius selector; TiN, NiB or PVD bolt carrier group upgrades; and an assortment of Vortex Optics products.“Partnering with One Horse is the kind of move that changes the conversation,” said Ryan Spadafore, CEO and founder of Atrius Development Group. “They represent what we respect in American manufacturing: family ownership, precision-driven production and a commitment to performance. We’re proud to stand alongside One Horse as we take that next step together. Together we win.”The One Horse Express Pistols will be available beginning July 30 at www.theonehorse.com/express. The limited initial production inventory will be offered exclusively through One Horse for direct-to-consumer orders, giving customers immediate access to the new platforms at launch. Dealer ordering will open after the initial inventory is sold, allowing One Horse to support its retail partners with a stronger inventory position and more consistent product availability as production scales.Firearms ship only to federally licensed firearms dealers. Availability is subject to applicable federal, state, and local laws. The two pistols are different from the rest of the Express line simply because of the handguard and brace rather than internals. The M-LOK version runs a 9.25-inch M-LOK Express Lock handguard with an SB Tactical SBA3 brace, while the Quad Rail version gets a 9.5-inch quad-rail handguard with full Picatinny coverage and an SBA5 brace. Both share the carbine-length gas system, dimpled and staked low-profile gas block, MPI'd M16-profile BCG, and Breek Arms Warhammer Mod2 charging handle from the rifle. Buyers can step up to an ambidextrous Atrius selector or a coated BCG at checkout. Both pistols will be sold beginning August 1st, with initial inventory sold direct through One Horse before dealer orders open.