CMMG MK3 Endeavor Upper Receiver Group .308 Winchester 20in Armor Black
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CMMG
Overview
The CMMG Mk3 Endeavor Upper Receiver Group is a complete upper assembly designed for the AR-10 platform, chambered in .308 Winchester. With a 20-inch barrel, this upper provides a balance of velocity and accuracy, making it suitable for a variety of shooting applications. It’s commonly used in builds focused on .308 Win caliber, catering to those looking for robust performance in a larger cartridge.
Specifications
CMMG MK3 Endeavor Upper Receiver Group .308 Winchester 20in Armor Black
Build history on GunPartPicker
Builders have been adding the CMMG MK3 Endeavor Upper Receiver Group .308 Winchester 20in Armor Black to their builds on GunPartPicker since February 2026. All time, it ranks #917 of the 1,654 upper receivers builders have added.
Today none of the 2 retailers we track has it in stock right now. Listed prices start at $920.33 at BattleHawk Armory for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
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