• Barrel Length- 12.5”
• Barrel Material- 41V50 Button Rifled Barrel, Nitride
• Chamber 5.56×45 NATO
• Twist Rate 1:7
• Muzzle Device Milspec A2 birdcage
• Extension- M4
• Gas System- Mid-length
• 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, K-SPEC 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
All KAK complete upper receivers are test fired for feed and function using commercially loaded ammunition
