The CMMG Banshee MK4 is a 9mm pistol-caliber platform with an 8-inch threaded barrel, a stabilizing brace, and ambidextrous controls. It has a 30+1 capacity and is finished in Cerakote Armor Black. The MK4 configuration includes a CMMG grip as shipped. 
 

Key Specifications 

• Brand: CMMG 
• Model: Banshee MK4 
• Caliber: 9mm 
• Action: Semi Auto 
• Barrel Length: 8 inches 
• Capacity: 30+1 rounds 
• Color/Finish: Armor Black (Cerakote) 
   

Detailed Features 

• 8-inch threaded barrel 
• Stabilizing brace included 
• Ambidextrous controls 
• CMMG grip as installed 
• Cerakote Armor Black finish

Owners of the Cerakote Armor Black CMMG Banshee MK4 in 9mm point to the threaded barrel and ambidextrous controls as the configuration's main selling points. The Armor Black Cerakote is widely liked for its durability and low-profile look. Build quality gets positive reviews overall, though some note the price reflects the specific combined configuration rather than a baseline Banshee.

The stabilizing brace is a consistent point of discussion. Owners who wanted it already appreciate having it included from the factory. Others find they swap it out quickly for a different setup. The 8-inch threaded barrel with the brace produces a compact, maneuverable setup that most users find practical.

The ambidextrous controls are consistently mentioned as a practical upgrade over single-sided setups, particularly by left-handed shooters. Value splits between those who pay the premium for the combined ambi-threaded configuration and those who feel the same result can be reached with a standard Banshee plus aftermarket parts for less money.