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CMMG
Overview
The CMMG MK4/AR-15 Forward Assist Upper Receiver Assembly Armor Black is a upper receiver. Compare prices from multiple merchants and find the best deal.
Specifications
CMMG MK4/AR-15 Forward Assist Upper Receiver Assembly Armor Black
September 2026 on GunPartPicker
CMMG MK4/AR-15 Forward Assist Upper Receiver Assembly Armor Black ranked #168 of the 615 upper receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since May 2026. All time, it ranks #142 of the 1,705 upper receivers builders have added.
It was out of stock everywhere we track for all of September 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $115.27 at BattleHawk Armory for when it comes 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
CMMG MK4/AR15 Stripped Lower Receiver - Armor Black
FN AR-15 M16 Barrel 16 Mid-Length 5.56mm
Geissele Automatics Geissele 5.56mm Reliability Enhanced Bolt Carrier Group & Gas Key 05-2992
Sons of Liberty Gun Works AR-15 Gas Tube Stainless Steel Mid-Length
AMBIDEXTROUS 5.56MM CHARGING HANDLE
Forward Controls Design Billet Gas Block - 0.625"
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
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