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CMMG
Overview
The CMMG Upper Receiver Assembly Mk3 is a stripped upper designed for the AR-10 platform, specifically chambered in .308 Win. Its tungsten finish not only provides a sleek look but also ensures durability in various environments. This upper receiver is typically paired with a carbine gas system, making it an ideal choice for builds that require reliable performance and precision in .308 Win configurations.
CMMG Upper Receiver Assembly MK3/.308WIN Tungsten Tungsten
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Builders on GunPartPicker first added the CMMG Upper Receiver Assembly MK3/.308WIN Tungsten Tungsten to a build in February 2026.
It was out of stock everywhere we track for all of August 2026, and today the one retailer we track is out of stock. Listed prices start at $279.99 at Optics Planet for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
We ranked every upper receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: Most Popular AR-15 Upper Receivers →Check it against the live catalog:
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