Upgrade your AR9 build with this precision-engineered complete upper from KAK Industry, designed to work flawlessly with AR9 lowers, including those from 5D Tactical. Chambered in 9mm, it features a durable 11" barrel paired with a lightweight 9.8" M-LOK free-float handguard, offering solid ergonomics, optimal balance, and versatile mounting options for your accessories.
This upper comes fully assembled.
It’s ready to install straight out of the box—no fitting, no guesswork.
Whether you’re building an AR9 pistol or a PCC-style carbine, this upper delivers the reliability and performance you need, backed by KAK Industry’s trusted reputation for quality.
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.
