KAK 5.56 NATO 13.9" Pin and Weld AR-15 Complete Upper Receiver 13" M-LOK

KAK Industry 5.56 13.9" Pin and Weld with 4 Prong Muzzle Device This has a pinned and welded muzzle device making it a legal rifle length 16"* Barrel Length- 13.9" (16" OAL with pinned muzzle device)* Barrel Material- 41V50 Button Rifled Barrel* Chamber 5.56x45 NATO* Twist Rate 1:7* Muzzle Device- KAK 4 Prong Flash Hider Pin and Welded* Extension- M4* Gas System- Midlength* 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- 13" High Quality 6061 T6 Material Mlok with Proprietary Clamping System and Heavy-Duty Barrel NutBCG-* 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