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CMMG
Overview
The CMMG Resolute MK4 Upper is a complete assembly designed for the AR-15 platform, featuring a 16.1-inch barrel chambered in the 6mm ARC caliber. This upper receiver is optimized for precision shooting, offering excellent ballistic performance and versatility for various applications. Commonly found in builds focusing on long-range accuracy, it integrates seamlessly with a rifle gas system to ensure reliable cycling and performance.
Specifications
CMMG Resolute MK4 6mm ARC Upper with 16.1" Barrel, Black - 60B1091AB
Available Merchants(4)
Prices checked
Price Alert
Build history on GunPartPicker
Builders have been adding the CMMG Resolute MK4 6mm ARC Upper with 16.1" Barrel, Black - 60B1091AB to their builds on GunPartPicker since February 2026. All time, it ranks #217 of the 1,683 upper receivers builders have added. Builds with this upper receiver are nearly all chambered in 6mm ARC, nearly all on rifle-length gas, and nearly all AR-15.
It was in stock most days in September 2026, and today 3 of the 4 retailers we track have it in stock. Prices barely moved in September 2026, holding around $682.74, so there haven't been real sales lately. Buying today, the lowest price is $799.99 at Optics Planet, above September's low of $682.74, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
BLEM PSA AR15 Complete Classic Stealth Lower, Black
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Strike Industries T-Bone AR-15 Charging Handle for .223/5.56 - Black/Black
CMC Triggers Enhanced Bolt Carrier Group, 6mm ARC, Black
Phase 5 Tactical Extended Ambidextrous Bolt Release V3 - Red Cerakote
Rise Armament AR-15 Magazine Release Button - Rise Red
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