CMMG Resolute MK3 8.6 Blackout 16.1 inch Upper Receiver 1-3 Twist 5/8 X 24 CMMG ZEROED Muzzle Brake Cerakote Armor Black
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CMMG
Overview
The CMMG Resolute Mk3 Upper Receiver is a complete assembly designed for the 8.6 Blackout caliber, featuring a 16.1-inch barrel that strikes a balance between maneuverability and ballistic performance. With a thread pitch of 5/8x24, this upper receiver is compatible with a variety of muzzle devices, allowing builders to customize their setup for optimal recoil management and sound suppression. This upper is commonly found in builds focused on versatility and tactical applications, making it a solid choice for those looking to enhance their AR-15 platform.
Specifications
CMMG Resolute MK3 8.6 Blackout 16.1 inch Upper Receiver 1-3 Twist 5/8 X 24 CMMG ZEROED Muzzle Brake Cerakote Armor Black
Available Merchants(5)
Prices checked
Price Alert
Build history on GunPartPicker
Builders have been adding the CMMG Resolute MK3 8.6 Blackout 16.1 inch Upper Receiver 1-3 Twist 5/8 X 24 CMMG ZEROED Muzzle Brake Cerakote Armor Black to their builds on GunPartPicker since April 2026. All time, it ranks #330 of the 1,683 upper receivers builders have added.
It was in stock most days in September 2026, and today 3 of the 5 retailers we track have it in stock. The best price drifted down from $999.87 to $921.43 over September 2026 without a real sale. Buying today, the lowest price is $921.43 at GritR Sports, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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