T6 Firearms 5.56 Nato 7.5″ Complete Pistol / 1:7 Twist / 7″ MLOK Handguard Specifications: Caliber:  5.56 Nato Upper Receiver:  Assembled Upper Receiver Charging Handle Bolt Carrier Group Barrel:  7.5″ Nitride Barrel Carbine Length Gas System Gas Block Roll Pin 1/2×28 TPI Thread 1:7 Twist Rate Lower: Complete Lower (Semi Automatic) Muzzle Device: A2 Flash Hider Stock Kit: Coil Spring SBA3 2.5″ Pistol Buffer Tube Handguard: 7″ Aluminum MLOK Style Barrel Nut with Rail Attachment and Screws Material: 7075 T6 Aluminum Color: Black – Cerakote