The Stag 10 Tactical Complete Upper comes with a precision machined Stag 10 Upper receiver ready to be combined with any compatible Stag 10 Lower of your choice. Its 16 inch barrel is chambered in .308 with a 1/10 twist rate. The barrel is coated with Black Nitride with a VG6 Gamma Compensator, and 13.5" Stag 10 SL M-LOK Handguard. ?* To prevent any confusion, the purchase of any Stag Arms Complete Upper does NOT include charging handle or BCG.