Conquer close-quarters with this compact 10.5 .300 Blackout Complete Upper Receiver. Featuring a 10.5 barrel with a 1:7 twist rate this upper ensures optimal stabilization for both subsonic and supersonic rounds making it ideal for tactical hunting or suppressed AR15 pistol builds. The 10 M-Lok handguard provides a lightweight modular platform for mounting accessories while the nitride-finished bolt carrier group delivers 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. – 10.5 .300 Blackout barrel with 1:7 twist for versatile bullet compatibility – 10 M-Lok handguard for secure customizable accessory attachment – Nitride-finished BCG and charging handle included – Made in the U.S.A – Ready to mount on any Mil-Spec AR15 lower receiver Build your ultimate .300 Blackout pistol-add to cart now! – Caliber: .300 BLK – Barrel Profile: Medium – Muzzle Thread: 5/8X24 – Twist Rate: 1/7 – Gas System: Pistol – Material: 4150 – Handguard Length: 10 in.