CMMG Banshee Mk4 AR-15 Upper Group .338 ARC 10.5" Barrel Black

The CMMG Banshee Mk4 AR-15 Upper Group in .338 ARC caliber is engineered for reliable performance in varied weather conditions, featuring a Cerakote finish that enhances corrosion resistance. This upper group combines the compact action direct impingement system with a 10.5-inch 4140CM nitride-finished barrel, designed to withstand environmental exposure while maintaining accuracy and durability.

Its Mk4 billet 6061 T6 aluminum upper receiver and EML9 handguard provide structural strength and heat dissipation, supporting consistent operation under adverse weather. The 1:8 twist rate barrel supports a range of .338 caliber projectiles, optimizing versatility for subsonic or supersonic loads with less gas system tuning required when switching between suppressed and unsuppressed firing.

Features

• Platform: Mk4
• Caliber: .338 ARC
• Operating System: Compact Action-Direct Impingement
• Barrel Length: 10.5 inches
• Barrel Twist Rate: 1:8
• Barrel Contour: MT
• Muzzle Device: CMMG ZEROED Linear Compensator
• Muzzle Thread: 5/8 x 24
• Gas Block: Non-Adjustable 0.750 inch
• Upper Receiver: Mk4 Billet 6061 T6 Aluminum
• Hand Guard: EML9
• Finish: Cerakote
• Charging Handle: Dissent Side Charger
• Weight: 3.1 lbs

Specifications

• Barrel Material: 4140CM Steel with Nitride Finish
• Color: Black
• MPN: 34B8D0F-AB
• UPC: 840442506247
• Condition: New
• Material: Aluminum