What's in the Box Complete Upper Receiver Assembly Nitride Bolt Carrier Group (BCG) Charging Handle Upgrade your rifle with this reliable 16" 5.56 NATO complete upper receiver. Designed for consistent accuracy and smooth operation, it features a free-float 15" M-Lok handguard for secure accessory mounting and improved barrel stability. The nitride-finished bolt carrier group ensures dependable cycling with minimal maintenance, while the full-length Picatinny top rail provides ample space for optics and accessories. Compatible with any Mil-Spec lower and proudly built in the USA, this upper is ready for serious use. Firearm Features 16" 5.56 NATO barrel Free-float 15" M-Lok handguard Nitride-finished bolt carrier group Mid-length gas system Full-length Picatinny rail Clamp-on mounting system Steel barrel nut and mounting screws A2 flash hider Firearm Specifications Manufacturer: Made in USA Model: Complete Upper Receiver Caliber: 5.56mm NATO Barrel Length: 16" Barrel Profile: SOCOM Muzzle Thread: 1/2x28 Twist Rate: 1:8 Gas System: Mid-Length Handguard Length: 15" Muzzle Device: A2 Flash Hider