The CMMG Banshee Mk4 is a semi-automatic AR-pattern pistol chambered in 5.56 NATO with a 10.5-inch threaded barrel. It has ambidextrous controls and a 30-round capacity. The finish is Midnight Bronze; transfer of a short-barreled configuration requires additional federal paperwork. 
 

Key Specifications 

• Brand: CMMG 
• Model: Banshee Mk4 
• Caliber: 5.56 NATO 
• Action: Semi Auto 
• Capacity: 30+1 
• Barrel Length: 10.5 in 
• Color/Finish: Midnight Bronze 
   

Detailed Features 

• 10.5-inch threaded barrel 
• Ambidextrous controls 
• 30-round magazine 
• Midnight Bronze Cerakote finish 
• AR-pattern Mk4 platform

Owners of the CMMG Banshee Mk4 in 5.56 NATO generally appreciate the compact AR-pattern format. The Midnight Bronze finish draws regular comments, with most owners happy with the look and durability, though a few note it shows wear at contact points faster than darker finishes.

The 10.5-inch barrel is a practical trade-off that most buyers accept. Muzzle blast is noticeably sharper than a rifle-length tube, and a suppressor or brake is a common pairing. Reliability with a variety of ammunition is a consistent positive in owner reports.

Ambidextrous controls are well-regarded across the board. The Mk4 platform's familiarity with standard AR accessories keeps the aftermarket straightforward, which owners cite as a practical advantage. Price relative to comparable AR-pattern pistols is an occasional point of debate.