The CMMG Banshee MK4 is a 9mm pistol-caliber platform with an 8-inch barrel and a 30+1 capacity. It is finished in Midnight Bronze. The MK4 configuration is chambered in 9mm and ships with a 30-round magazine. 
 

Key Specifications 

• Brand: CMMG 
• Model: Banshee MK4 
• Caliber: 9mm 
• Action: Semi Auto 
• Barrel Length: 8 inches 
• Capacity: 30+1 rounds 
• Color/Finish: Midnight Bronze 
   

Detailed Features 

• 8-inch barrel in a compact pistol-caliber configuration 
• Midnight Bronze receiver finish 
• Ships with a 30-round magazine 
• MK4 platform chambered in 9mm

Owners of the CMMG Banshee MK4 in 9mm consistently note the compact footprint and smooth cycling of the MK4 configuration. Feedback on build quality runs positive, with the Midnight Bronze finish drawing attention as a standout color option. The common complaint is that the finish shows contact wear more quickly than a matte black alternative.

The 8-inch barrel length generates some discussion. Buyers who wanted a short, maneuverable setup are satisfied, while others feel the barrel is short enough to create limitations in certain conditions. Ergonomics get solid marks from owners familiar with pistol-caliber platforms.

Pricing on the Banshee MK4 splits opinion. Those who prioritize CMMG manufacturing tolerances consider it worth the cost. Others in the pistol-caliber category point to competing options at lower price points and question whether the Banshee commands its premium strictly on performance grounds.