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CMMG
Overview
The CMMG RESOLUTE 300 MK4 is a complete upper receiver designed for the AR-15 platform, chambered in 5.56 NATO. Its 1/2x28 thread pitch allows for compatibility with standard muzzle devices, enhancing your build's versatility. This upper receiver is commonly used in tactical and sport shooting builds, where reliability and performance are essential.
Specifications
Available Merchants(1)
Prices checked
Price Alert
Price and stock
The CMMG RESOLUTE 300 MK4 5.56 was out of stock everywhere we track for all of September 2026, and today the one retailer we track is out of stock. Listed prices start at $1,269.99 at Guns.com for when it comes back.
Prices checked · refreshed daily across 37 retailers
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