KAK Complete AR15 Upper Receiver - 9mm - 4" Barrel - 5.5" MLOK

KAK Complete AR15 Upper Receiver - 9mm - 4" Barrel - 5.5" MLOK

$429.95
(No reviews yet) Write a Review
SKU:
MO-453-1010-002
Weight:
1.00 LBS

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 complete upper comes fully assembled and ready to install, featuring a 4" 41V50 button-rifled barrel and a 5.5" M-LOK free-float handguard, and includes a one-piece bolt carrier group (BCG) and charging handle. Ideal for compact AR9 pistols or carbines, this upper delivers reliable blowback performance and modularity right out of the box.

Features:

  • 4" 41V50 button-rifled barrel for durability and consistent short‑range performance

  • Chambered in 9mm NATO with a 1:10" twist optimized for common 9mm projectiles

  • KAK Flashcan muzzle device (1/2-36) for compact muzzle protection and aesthetics

  • Blowback action tuned for reliable 9mm operation

  • 5.5" M-LOK free-float handguard (6061 T6) with proprietary clamping system and heavy‑duty barrel nut for secure accessory mounting

  • Forged 7075‑T6 upper receiver, precision machined to M16/M4 specifications

  • One‑piece weighted BCG: auto profile carrier machined from 8620 steel with Black Nitride finish

  • Firing pin machined from 8740, precision ground and chrome plated

  • One‑piece billet enhanced extractor (phosphate coated); S7 tool steel ejector and extractor retaining pin

  • 4130 nitride gas key, Grade 8 carrier key screws, hydraulically staked for durability

  • Milspec charging handle with enhanced large billet latch

  • Weighted BCG compatible with Colt‑ and Glock‑style 9mm magazines

  • Test‑fired for feed and function with commercially loaded ammunition by KAK Industry

  • Note: Does not support last‑round bolt hold‑open (LRBHO) when used with KAK AR9 lowers

Specifications:

  • Manufacturer: KAK Industry

  • Model: 4" AR9 Complete Upper – 5.5" M-LOK

  • Caliber: 9mm NATO

  • Barrel Length: 4"

  • Barrel Material: 41V50 button‑rifled steel

  • Twist Rate: 1:10"

  • Muzzle Device: KAK Flashcan (1/2-36)

  • Gas System: Blowback (9mm)

  • Upper Receiver Material: Forged 7075‑T6 Aluminum, precision machined to M16/M4 spec

  • Handguard: 5.5" M‑LOK free‑float (6061 T6) with proprietary clamp and heavy‑duty barrel nut

  • Charging Handle: Milspec with enhanced large billet latch

  • BCG: One‑piece weighted carrier, 8620 steel, Black Nitride finish; firing pin 8740 (chrome plated); billet extractor (phosphate coated); S7 ejector; 4130 gas key (nitride)

  • Carrier Key Screws: Grade 8, properly heat treated and staked

  • Compatibility: Works with Colt‑ and Glock‑style 9mm magazines; does not enable LRBHO with KAK AR9 lowers

  • Included: Bolt Carrier Group, Charging Handle, Forward Assist, Dust Cover

  • Test/Assembly: Assembled and function‑tested by KAK Industry

Shipping Restrictions:
This item cannot be shipped to: Colorado, Connecticut, Hawaii, Illinois, Maryland, Nevada, New Jersey, New York, Philadelphia, York City, Reading (PA), Rhode Island, Washington, and Washington D.C.

Related Products

!