CMMG Banshee 300 MkGs 9mm AR Complete Upper - 5"
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Overview
The CMMG Banshee 300 MkGs 9mm AR Complete Upper is a fully assembled upper receiver designed for AR-9 builds, featuring a compact 5-inch barrel optimized for 9mm ammunition. The 1/2x28 thread pitch makes it compatible with a wide range of muzzle devices, allowing builders to customize their setup for suppressors or compensators. This upper is well-suited for short-barreled configurations and is popular among those looking to build lightweight, maneuverable firearms for competition or tactical use.
Specifications
Price and stock
The Unknown CMMG Banshee 300 MkGs 9mm AR Complete Upper - 5" 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 $559.36 at BattleHawk Armory for when it comes back.
Prices checked · refreshed daily across 35 retailers
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