CMMG Banshee 300 MkGs 9mm AR Complete Upper - 5"
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CMMG
Overview
The CMMG Banshee 300 MkGs is a complete upper receiver designed specifically for the AR-9 platform, featuring a 5-inch barrel chambered in 9mm. This compact upper is engineered to provide reliable function and performance for shooters looking to build a dedicated pistol caliber carbine. While it is tailored for 9mm builds, it can also integrate into a variety of configurations, including those using the .223 Wylde caliber.
Specifications
Available Merchants(3)
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Build history on GunPartPicker
Builders have been adding the CMMG Banshee 300 MkGs 9mm AR Complete Upper - 5" to their builds on GunPartPicker since February 2026. All time, it ranks #916 of the 1,652 upper receivers builders have added.
It was out of stock everywhere we track for all of September 2026, and today none of the 3 retailers we track has it in stock right now.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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