Upgrade your rifle with this dependable 16 .300 BLK complete upper receiver. Built for accuracy and smooth performance, it features a free-float 15 M-Lok handguard for solid accessory mounting and improved barrel stability. The nitride BCG delivers reliable cycling and low-maintenance durability, while the full-length Picatinny rail gives you plenty of room for optics. Ready to pin onto any Mil-Spec lower, this upper is built in the U.S.A. and ready for work. Every One Horse rifle and component is made in America with uncompromising standards. We use U.S.-sourced materials, U.S. manufacturing, and strict quality control at every step. No shortcuts, no imported surprises just dependable parts built by people who take pride in American craftsmanship. When you run One Horse, you re running gear you can trust every single day. Product Specifications Caliber: .300 BLK Barrel Length: 16 in. Barrel Profile: SOCOM Muzzle Thread: 5/8X24 Twist Rate: 1/7 Gas System: Pistol Muzzle Device: A2 Material: 4150 Handguard Length: 15 in. Manufacturer: One Horse Country of Origin: U.S.A.