One Horse OH-15 Express 5.56 10.5" Pistol Powered by Atrius The One Horse OH-15 Express 5.56 pistol powered by Atrius delivers a factory-tuned compact AR-15 platform, available now at Battlehawk Armory. This 10.5-inch M-LOK pistol is built around a professionally installed Atrius Forced Reset Selector that is fit, timed, and tested at the factory for consistent operation. Chambered in 5.56 NATO / .223 Remington, the Express configuration is designed to run reliably right out of the box in a compact pistol format. The Atrius selector offers three positions-Safe, Semi, and Super-Semi-so shooters can move between standard semi-automatic fire and the accelerated Super-Semi setting without assembling or timing the system themselves. 7075-T6 aluminum receivers with Type III hardcoat anodizing, an M16-profile black nitride bolt carrier group, M-LOK free-float handguard, and Express-series components complete a purpose-built package. Ships with one 30-round magazine. A factory-tuned 10.5-inch 5.56 pistol built for shooters who want a ready-to-run Express platform. Add the One Horse OH-15 Express 5.56 10.5" Pistol Powered by Atrius to your collection at Battlehawk Armory today. Specifications Manufacturer: One Horse Model: OH-15 Express Pistol SKU: OHX-APS01 Caliber: 5.56 NATO / .223 Remington Barrel Length: 10.5" Action: Semi-Automatic, Direct Impingement Receivers: 7075-T6 Aluminum, Type III Hardcoat Anodized Handguard: M-LOK Free-Float Bolt Carrier Group: M16 Profile, Black Nitride Selector: Atrius Forced Reset Selector (Safe / Semi / Super-Semi) Charging Handle: Breek Arms Warhammer Trigger: Single-Stage Curved Magazine: One 30-Round Country of Origin: USA