Enhance your AR-15 build with the TacFire SPBU-556-16 AR-15 5.56 NATO 16" Upper Receiver Kit, designed for precision and durability.This kit features a 16-inch M4 profile barrel crafted from high-quality steel, ensuring reliable performance. With an M-LOK handguard for versatile attachment options and an A2 flash hider for reduced muzzle rise, this upper receiver is built for serious shooters.Completely AssembledCaliber: 5.56x45mm NATOBarrel Length: 16 inM4 Profile with Carbine Length Gas SystemBarrel Twist Rate: 1-8Handguard Type: M-LOK ATLAS S-ONEMuzzle Device: A2 Flash HiderFinish: Black NitrideGun Model: AR-15Does not come with Lower or MagazineElevate your shooting experience with unmatched quality and performance.