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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.
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Stock Alert
October 2026 on GunPartPicker
Unknown CMMG Banshee 300 MkGs 9mm AR Complete Upper - 5" ranked #360 of the 844 upper receivers builders added on GunPartPicker in October 2026.
It was out of stock everywhere we track every time we checked in October 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.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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