If there is one word to describe 8.6 Blackout, it is versatility. Drawing from the success of its smaller predecessor, .300 AAC Blackout, this powerhouse cartridge excels in both subsonic suppressed applications and supersonic performance when delivering maximum impact on target. Designed for adaptability, it offers an exceptional balance of power and precision, making it a go-to choice for shooters who demand reliability across multiple scenarios. Navigating the complexities of .308 Win AR platform compatibility can be challenging, but CMMG simplifies the process by basing the Mk3 platform on the popular Gen 1 DPMS High-Pattern LR308 design. This ensures a broader range of parts availability and greater customization potential, giving shooters the flexibility to tailor their build to their exact specifications. CMMG upper groups come fully equipped for performance right out of the box, featuring a complete bolt carrier group and Zeroed accessories. Each upper includes a Zeroed Mk3 polymer dust cover, a Zeroes AR-10/Mk3 ambi charging handle, and a Zeroed muzzle brake designed specifically for 8.6 Blackout. With seven Cerakote finishes to choose from, these upper groups offer both style and function, making them a standout choice for shooters looking to optimize their AR platform.

The armor Cerakote finish provides a tough, durable coating that protects against wear and harsh conditions
The 5/8-24 muzzle threading is standard for a variety of suppressors and muzzle devices
The CMMG zeroed muzzle brake effectively reduces recoil and muzzle rise, ensuring faster follow-up shots and improved accuracy
The billet 7075-T6 aluminum construction offers exceptional strength and durability, ideal for demanding applications
The CMMG EML15 M-LOK handguard offers a lightweight, durable design with ample mounting space for accessories
The 16.1 inches barrel features a 1:3 twist, designed for specialized ammunition

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It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

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.