Barrel Length-4.75Barrel Material- 41V50 Button Rifled BarrelChamber 5.56x45 NATOTwist Rate 17Muzzle Device Milspec A2 birdcageExtension- M4Gas System- Micro lengthGas Block- Low profile .750 Nitride FinishCharging Handle- Milspec with Enhanced Large Billet LatchUpper Receiver- Forged 7075 T6 Aluminum, Precision Machined to M16/M4 SpecHandguard- 4, 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 TreatedLowerKAK Industries billet AR15 lower receiver is precision CNC machined from a solid block of high quality aircraft grade aluminum. All internal dimensions are cut to the proper military dimensions. Full M4/M16 spec fire control pocket. All receivers are media blasted and have a deep lustrous hard coat anodizing. Machined from a solid block of aircraft quality aluminumFull M4/M16 style fire control group pocketPictogram selector markings on both sidesAccepts all standard/Milspec AR15 componentsCompatible with drop in trigger assembliesTumbled, deburred, media blastedCaliber MULTIType 3 Class II hard coat anodized - deep matte blackFire Control Group- MilspecGrip- A2Pistol Buffer TubeIncludes 1x 30 Round GI Magazine (where applicable)All KAK complete firearms are test fired for feed and function using commercially loaded ammunition