Who needs a long barrel when you have the cutting-edge performance of 8.6 Black With an ultra-fast 1:3 twist rate, this caliber maximizes energy and effectiveness in a shorter barrel, delivering performance that other calibers can only dream of. Whether upgrading an existing rifle or starting a new build, this upper provides an outstanding platform for shooters looking to harness the full potential of 8.6 Black. Built on the proven CMMG Mk3 platform, which follows the DPMS Gen 1 high-pattern LR308 design, this upper ensures compatibility with a wide range of components, offering greater customization and reliability. Designed for durability and precision, every CMMG upper group includes a complete bolt carrier group and Zeroed accessories, such as the Zeroed polymer dust cover .308 Win, Zeroed AR-10/Mk3 ambi charging handle, and Zeroed linear compensator 8.6 Blackout. With multiple Cerakote finish options, this upper combines cutting-edge function with a sleek and rugged aesthetic.

The armor Cerakote finish provides a tough, durable coating that protects against wear and harsh conditions
M-LOK handguard, featuring a sleek and efficient design, enabling you to mount various accessories for a more functional setup
The 12-1/2 inches barrel features a 1:3 twist for specialized ammunition

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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.