KAK Industry Complete AR10 Upper Receiver- 308, 12.5" Barrel- 9.8" MLOK* Barrel Length- 12.5"* Barrel Material- 41V50 Button Rifled Barrel* Chamber- 308 Winchester 7.62 NATO* Twist Rate- 1:10* Muzzle Device- A2 birdcage 5/8-24* Gas System- Carbine Length* Gas Block- Low profile .750 Nitride Finish* Charging Handle- Milspec with Enhanced Large Billet Latch* Upper Receiver- Billet LR-308/ DPMS Pattern* Handguard- 9.8" High Quality 6061 T6 Material Mlok with Proprietary Clamping System and Heavy-Duty Barrel NutBCG* Auto Profile Carrier Machined from Aircraft/ Bearing Quality 8620 Steel, Properly Heat Treated, Ground to Perfection, BlackNitride(TM) Finish by H&M* Bolt- KAK Industry Dual Ejector, MPI Tested and Marked, Nitride Finish