KAK Complete AR15 Upper Receiver - 9mm - 4" Barrel - 2.9" MLOK

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  • Barrel Length- 4”
  • Barrel Material- 41V50 Button Rifled Barrel
  • Chamber 9MM NATO
  • Twist Rate 1:10
  • Muzzle Device Milspec A2 birdcage 1/2-36
  • Gas System- Blowback 
  • Upper Receiver- Forged 7075 T6 Aluminum, Precision Machined to M16/M4 Spec
  • Handguard- 2.9”, High Quality 6061 T6 Material Mlok with Proprietary Clamping System and Heavy-Duty Barrel Nut


  • BCG
  • One piece BCG
  • Auto Profile Carrier Machined from Aircraft/ Bearing Quality 8620 Steel, Properly Heat Treated, Ground to Perfection, BlackNitride Finish by H&M
  • Firing pin is machined 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, nitride, precision staked using our hydraulic staking machine
  • Carrier key screws- Grade 8, Properly Heat Treated and staked

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