Dominate close-quarters scenarios with this 10.5" 5.56 NATO Complete Upper Receiver. Featuring a 10.5" barrel with a 1:7 twist rate, this upper delivers reliable bullet stabilization for a wide range of 5.56 NATO ammunition, ideal for tactical, home defense, or short-barreled rifle (SBR) and pistol builds. The 10" M-Lok rail provides a lightweight, modular platform for mounting accessories, while the nitride-finished bolt carrier group ensures smooth cycling, enhanced durability, and low maintenance. Complete with a charging handle and built to Mil-Spec standards, this upper is ready to pair with any AR15 Mil-Spec lower receiver for a seamless, high-performance setup. Caliber: 5.56mm NATO Barrel Profile: Medium Muzzle Thread: 1/2X28 Twist Rate: 1/7 Gas System: Pistol Material: 4150 Handguard Length: 10 in. Charging Handle: Standard Manufacturer: One Horse