Brownells and KAK Industry have collaborated to develop a high-performance complete upper assembly, offering exceptional value. This premium assembly includes a chrome-lined barrel, a chrome-lined phosphate K-Spec enhanced bolt carrier group (BCG), a Brownells exclusive PentaComp muzzle device and a robust free-float KAK Industry M-LOK handguard. Manufactured entirely in the United States, it ensures years of reliable service. The K-Spec down vent BCG is engineered for superior reliability, incorporating slotted angled carrier rails, dual ejectors and downward gas vents that channel gas beneath the carrier, minimizing exposure to the shooter. This feature significantly enhances performance during suppressed shooting with a traditional baffle suppressor.

7075-T6 forged upper receivers
Intermediate length gas system
1/2-28 muzzle threads featuring the Brownells exclusive PentaComp device
Chrome-lined phosphate K-SPEC enhanced bolt carrier group (BCG)
Enhanced charging handle with large billet latch
Barrel specifications - 14-1/2 inches 4150 chrome molybdenum vanadium (CrMoV) steel, chrome-lined, featuring a 1:7 twist rate and subjected to dual stress relief processes
13 inches M-LOK handguard featuring a robust barrel nut

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All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.

KAK Industry K-Spec 14.50" Railed Upper 5.56x45mm 1:7 Mid-Length w/BCG&CH, Black