Complete AR15 Upper Receiver - 5.56 NATO - 13.9" Barrel - 13" MLOK, 4 Prong FH, Pin and Weld

KAK Industry 5.56 13.9" Pin and Weld with 4 Prong Muzzle Device\n\nThis has a pinned and welded muzzle device making it a legal rifle length 16"\n\n- Barrel Length- 13.9" (16" OAL with pinned muzzle device)\n- Barrel Material- 41V50 Button Rifled Barrel, Nitride\n- Chamber 5.56x45 NATO\n- Twist Rate 1:7\n- Muzzle Device- KAK 4 Prong Flash Hider Pin and Welded\n- Extension- M4\n- Gas System- Midlength\n- Gas Block- Low profile .750 Nitride Finish\n- Charging Handle- Milspec with Enhanced Large Billet Latch\n- Upper Receiver- Forged 7075 T6 Aluminum, Precision Machined to M16/M4 Spec\n- Handguard- 13" High Quality 6061 T6 Material Mlok with Proprietary Clamping System and Heavy-Duty Barrel Nut\n- Weight- 4.18#\n- BCG-\n- M16 Auto Profile Carrier Machined from Aircraft/ Bearing Quality 8620 Steel, Properly Heat Treated, Ground to Perfection\n- Bolt is machined from a single piece aircraft/bearing quality 9310 steel, heat treated properly, precision ground, Shot Peened and MPI’d\n- 4130 Gas Key, precision staked using our hydraulic staking machine\n- KAK Carrier Key Screws- T25 drive, Grade 8, Properly Heat Treated,\nMade in the USA