One Horse HBAR Complete Upper Features The One Horse HBAR Complete Upper is built around a 16 inch 4150 steel barrel in an HBAR profile giving the rifle increased rigidity and heat resistance compared to a lighter contour barrel. A 1 in 8 twist rate stabilizes a wide range of 5.56 NATO and .223 Rem bullet weights making the upper versatile for both target shooting and hunting varmint-weight loads. The barrel is threaded 1/2x28 accepting standard muzzle devices for shooters who want to add a brake compensator or suppressor adapter. A mid-length gas system cycles the action smoothly reducing felt recoil compared to a carbine-length system on a 16 inch barrel. A nitride-finished bolt carrier group pairs with the barrel to deliver reliable cycling and long service life with minimal cleaning and lubrication. The free-float 15 inch M-LOK handguard isolates the barrel from accessory-induced pressure helping preserve accuracy while giving shooters ample real estate for lights grips and other attachments. A full-length Picatinny rail on top of the upper receiver offers generous space for mounting optics and accessories. Built in the USA and designed to pin directly onto any Mil-Spec AR-15 lower this One Horse upper is a dependable ready-to-run option for any AR build. One Horse HBAR Complete Upper Specifications Manufacturer: One Horse Model: HBAR Complete Upper Caliber: 5.56mm Barrel Length: 16 Barrel Profile: HBAR Twist Rate: 1:8 Muzzle Thread: 1/2x28 Gas System: Mid-Length Material: Steel Aluminum Color: Black Handguard Length: 15 Compliance Firearm Pattern: AR-15 Available At: GrabAGun