The CMMG Banshee Mk4 Upper Suppressed 300BLK 6.5 Black is a purpose-built upper receiver group that maximizes the .300 Blackout cartridge for quiet, smooth performance. Built on a Mk4 billet 6061-T6 aluminum upper with a full-length Picatinny rail, it features a 6.5" barrel and ZEROED 30 suppressor nested inside an 11" M-LOK handguard that accepts up to 1.5" diameter suppressors.

This complete upper is ideal for shooters wanting a compact, suppressed .300 BLK platform for range use, training, or general-purpose shooting when paired with any standard Mk4/AR-15 lower receiver. The direct impingement operating system, adjustable .750 gas block, and 1:07 twist barrel work together for reliable cycling with a wide range of ammunition. CMMG’s attention to detail, from the ZEROED ambidextrous charging handle to the durable Cerakote finish, reflects the brand’s reputation for thoughtful engineering and modern AR innovation.

Key Features:

• Manufacturer: CMMG
• Model: Banshee Mk4 Upper Suppressed 300BLK 6.5
• Caliber: .300 BLK
• Operating System: Direct Impingement
• Barrel Length: 6.5"
• Barrel Twist: 1:07
• Barrel Contour: MT
• Barrel Material: 4140CM Nitride
• Muzzle Device: ZEROED 30
• Muzzle Thread: 5/8 x 24
• Gas Port Location: Pistol
• Gas Block: .750 Adjustable
• Upper Receiver: Mk4 Billet 6061 T6 Aluminum
• Hand Guard: 11" M-LOK
• Charging Handle: CMMG ZEROED Ambi
• Weight: 4.3 lbs
• Length: 19.5"