Upgrade your next AR9 build with this complete upper assembly from KAK Industry, engineered to pair perfectly with 80% AR9 lowers. Chambered in 9mm, this upper features a durable 11" barrel and a sleek 9.8" M-LOK free-float handguard, offering excellent modularity and balance for pistol-caliber carbine setups.
This upper ships fully assembled and includes a bolt carrier group, charging handle, forward assist, and dust cover—ready to mount and go, straight out of the box.
Perfect for building your AR9 pistol or carbine, this upper offers reliability, performance, and clean fitment—all backed by KAK Industry’s commitment to quality. No guesswork. No hassle. Just performance you can count on.
Upper
- Barrel Length- 11”
- 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- 9.8”, High Quality 6061 T6 Material M-lok 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, Black Nitride 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.
Shipping Restrictions:
This item is restricted from shipping to the following: Colorado, Connecticut, Hawaii, Illinois, Maryland, Nevada, New Jersey, New York, Philadelphia, York City, and Reading Pennsylvania, Rhode Island, Washington, and Washington D.C.
