CMMG MK4 .300BLK Banshee Upper Group Receiver 12.5in Midnight Bronze
3 options
- Coyote · Tanout of stock
- Midnight · Bronze, this page
- Tungstenout of stock
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CMMG
Overview
The CMMG Mk4 .300BLK Banshee Upper Group Receiver features a complete assembly designed specifically for the AR-15 platform. With a 12.5-inch barrel optimized for .300 Blackout, this upper receiver offers versatility for both suppressed and unsuppressed shooting, making it suitable for a variety of shooting scenarios. This upper commonly appears in short-barreled rifle builds where compactness and maneuverability are key.
Specifications
CMMG MK4 .300BLK Banshee Upper Group Receiver 12.5in Midnight Bronze
3 options
- Coyote · Tanout of stock
- Midnight · Bronze, this page
- Tungstenout of stock
September 2026 on GunPartPicker
CMMG MK4 .300BLK Banshee Upper Group Receiver 12.5in Midnight Bronze ranked #267 of the 615 upper receivers builders added on GunPartPicker in September 2026. Builders on GunPartPicker first added it to a build in March 2026.
Today the one retailer we track is out of stock. Listed prices start at $799.99 at Optics Planet for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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