CMMG Dissent MK4 Upper .300 AAC Blackout 10.5 Barrel
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CMMG
Overview
The CMMG Dissent MK4 Upper is a complete upper receiver chambered in .300 AAC Blackout with a 10.5-inch barrel, making it an ideal choice for compact builds that require versatility in ammunition choices. This upper is designed to deliver reliable performance in both suppressed and unsuppressed configurations, allowing builders to easily adapt to various shooting scenarios. It commonly appears in short-barreled rifle (SBR) builds where mobility and power are crucial.
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Available Merchants(4)
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August 2026 on GunPartPicker
CMMG Dissent MK4 Upper .300 AAC Blackout 10.5 Barrel ranked #291 of the 690 upper receivers builders added on GunPartPicker in August 2026. Builders on GunPartPicker first added it to a build in April 2026.
Today none of the 4 retailers we track has it in stock right now. Listed prices start at $1,134.99 at Palmetto State Armory for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
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