This AR-9 80% build kit, featuring a billet 6061 80% lower, includes all the high-quality components needed to complete your AR-9 at home—eliminating the guesswork from building a reliable, performance-driven firearm.
Our Complete AR-9 80% Build Kit Features:
- KAK Complete AR15 Upper Receiver - 9mm - 8" Barrel - 9" MLOK
- 5D Tactical Billet 6061 AR-9 80% Lower
- SB Tactical SBA5 Brace
- Smith Defense 7.5 oz 6-Position Carbine Buffer Tube Kit
- Smith Defense AR-15 Lower Parts Kit
About the kit:
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.
Shipping Restrictions: This item is restricted from shipping to California, Connecticut, New Jersey, New York, Washington D.C, Washington, Hawaii, Colorado, Cities of Philadelphia - York - Reading Pennsylvania, Maryland, Massachusetts, Nevada, Illinois, Vermont, and Rhode Island
Under California law, this product is or contains an unserialized “firearm precursor part” and cannot be sold into the State of California. 80% Arms cannot accept any orders of this product for shipment to the State of California, or to any customer who is a resident of the State of California.
