KAK Complete AR15 Upper Receiver - 300 Blackout - 4.75" Barrel - 5.5" MLOK

UpperBarrel Length-4.75"Barrel Material- 41V50 Button Rifled BarrelChamber 300 BLKTwist Rate 1:7Muzzle Device- KAK Flash Can 5/8-24Extension- M4Gas System- Micro lengthGas Block- Low profile .750 Nitride FinishUpper Receiver- Forged 7075 T6 Aluminum, Precision Machined to M16/M4 SpecHandguard- 5.5", High Quality 6061 T6 Material Mlok with Proprietary Clamping System and Heavy-Duty Barrel NutBCGM16 Auto Profile Carrier Machined from Aircraft/ Bearing Quality 8620 Steel, Properly Heat Treated, Ground to Perfection, BlackNitride Finish by H&MBolt is machined from a single piece aircraft/bearing quality 9310 steel, heat treated properly, precision ground, Shot Peened and MPI'dFiring pin is machined to the mil-spec print from 8740, precision ground, and chrome platedOne Piece Billet Fully Machined Enhanced Extractor, Phosphate coated for Increased reliability and corrosion resistanceNitride Cam PinS7 tool steel ejector and extractor retaining pin4130 Gas Key, nitride, precision staked using our hydraulic staking machineKAK Carrier Key Screws- T25 drive, Grade 8, Properly Heat Treated and stakedAll KAK complete upper receivers are test fired for feed and function using commercially loaded ammunition