KAK Industry 5.56 12.5" Pin and Weld with extended Flash hider This has a pinned and welded muzzle device making it a legal rifle length 16" URG * Barrel Length- 12.5" (16" OAL with pinned muzzle device) * Barrel Material- 41V50 Button Rifled Barrel * Chamber 5.56x45 NATO * Twist Rate 1:7 * Muzzle Device- KAK 4" Extended Flash Hider Pinned and Welded * Extension- M4 * Gas System- Carbine * Gas Block- Low profile .750 Nitride Finish * Charging Handle- Milspec with Enhanced Large Billet Latch * Upper Receiver- Forged 7075 T6 Aluminum, Precision Machined to M16/M4 Spec * Handguard- 9.8" High Quality 6061 T6 Material Mlok with Proprietary Clamping System and Heavy-Duty Barrel Nut BCG- * M16 Auto Profile Carrier Machined from Aircraft/ Bearing Quality 8620 Steel, Properly Heat Treated, Ground to Perfection, BlackNitride(TM) Finish by H&M * Bolt is machined from a single piece aircraft/bearing quality 9310 steel, heat treated properly, precision ground, Shot Peened and MPI'd * KAK Carrier Key Screws- T25 drive, Grade 8, Properly Heat Treated, Made in the USA