CMMG Upper Receiver Assembly MK4/AR15 Forward Assist Coyote Tan

CMMG Upper Receiver Assembly Mk4/AR15 Forward Assist Coyote Tan - Upper Receiver for AR-15 - view 1
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CMMG

Overview

The CMMG Upper Receiver Assembly Mk4 is a stripped upper designed for the AR-15 platform, featuring a coyote tan finish that adds a touch of style while maintaining functionality. This assembly allows builders to customize their rifle from the ground up, accommodating various components according to their specific needs. Commonly found in builds with a pistol gas system and chambered for 300 Blackout, this upper receiver is ideal for those looking to create a compact and versatile firearm.

Specifications

MPN55BA206CT
ColorFDE
AssemblyStripped
PlatformAR-15

Available Merchants(1)

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$128

Build history on GunPartPicker

Builders have been adding the CMMG Upper Receiver Assembly MK4/AR15 Forward Assist Coyote Tan to their builds on GunPartPicker since March 2026. All time, it ranks #224 of the 1,636 upper receivers builders have added. Builds with this upper receiver are mostly chambered in 300 Blackout (75%, then 5.56 NATO 25%), mostly on pistol-length gas (75%, then carbine-length 25%), and nearly all AR-15.

It was hard to find in August 2026, in stock on only 5 of the 10 days we checked, and today the one retailer we track is out of stock. The best price drifted down from $129.99 to $123.99 over August 2026 without a real sale. Listed prices start at $127.99 at Optics Planet for when it comes back.

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Frequently Built With

The part most often added in each category by the 11 builds that include this one

Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Caliber

75%
300 Blackout75%
5.56 NATO25%

Gas System

75%
Pistol75%
Carbine25%

Builds Featuring This Part

See all 1 →

Builds in the community that include the CMMG Upper Receiver Assembly Mk4/AR15 Forward Assist Coyote Tan

BuildPartsTotal
PDW 16" 5.56 build
PDW 16" 5.56
25$1045.81

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