5.56 Complete Upper Receiver- 12.5″ 416R barrel, 1 5 fast twist, 11.7″ MLOK

Description

Chamber- 5.56 NATO

• Length- 12.5″

• Gas system- Mid Length

• Gas Port Size- .076

• Threads- 1/2×28

• Finish- 416 R Stainless 

• Twist- 1:5

• Gas Block- Low profile .750 Phosphate Finish

• Charging Handle- Milspec with Enhanced Large Billet Latch

• Upper Receiver- Forged 7075 T6 Aluminum, Precision Machined to M16/M4 Spec

• Handguard- 11.7″ High Quality 6061 T6 Material Mlok with Proprietary Clamping System and Heavy-Duty Barrel Nut

BCG chrome lined phosphate comes standard, Upgrades available, K-SPEC suppressor optimized down vent BCG upgrade available

• M16 Auto Profile Carrier Machined from Aircraft/ Bearing Quality 8620 Steel, Properly Heat Treated, Ground to Perfection
• Bolt is machined from a single piece aircraft/bearing quality 9310 steel, heat treated properly, precision ground, Shot Peened and MPI’d
• Firing pin is machined to the mil-spec print from 8740, precision ground, and chrome plated
• One Piece Billet Fully Machined Enhanced Extractor, Phosphate coated for Increased reliability and corrosion resistance
• S7 tool steel ejector and extractor retaining pin
• 4130 Gas Key, precision staked using our hydraulic staking machine
• KAK Carrier Key Screws- T25 drive, Grade 8, Properly Heat Treated

   3# 15 oz with BCG and charging handle 

All KAK complete upper receivers are test fired for feed and function using commercially loaded ammunition