Upgrade your next AR9 build with this complete upper assembly from KAK Industry, precision-engineered to pair seamlessly with AR9 lowers. Chambered in 9mm, it features a robust 8" barrel and a streamlined 9" M-LOK free-float handguard, delivering optimal balance and customization for your pistol-caliber carbine setup.
This upper comes fully assembled.
It’s ready to drop in—no fitting, tuning, or hassle required.
Whether you're building a compact AR9 pistol or a full PCC platform, this upper delivers reliable performance and clean fitment—backed by KAK Industry’s reputation for quality and durability.
Upper
- Barrel Length- 8”
- Barrel Material- 41V50 Button Rifled Barrel
- Chamber 9MM NATO
- Twist Rate 1:10
- Muzzle Device- KAK Flashcan 1/2-36
- Gas System- Blowback
- Upper Receiver- Forged 7075 T6 Aluminum, Precision Machined to M16/M4 Spec
- Handguard- 9”, High Quality 6061 T6 Material Mlok with Proprietary Clamping System and Heavy-Duty Barrel Nut
- Charging Handle- Milspec with Enhanced Large Billet Latch
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
- Weighted 1 Piece BCG, works with all types of hammers, compatible with Colt and Glock Style Magazines
All KAK complete upper receivers are test fired for feed and function using commercially loaded ammunition
Please note: KAK Industry 9mm uppers do not support last round bolt hold open (LRBHO) functionality when used with our AR9 lowers.
