The CMMG Banshee Mk4 is an AR-pattern pistol chambered in .300 AAC Blackout with an 8-inch threaded barrel and a 30+1 round capacity. It ships with Coyote Tan finish, M-LOK handguard, Picatinny rail, and a Black RipBrace stabilizing brace. The Zeroed Grip is included as part of the factory configuration. 
 

Key Specifications 

• Brand: CMMG 
• Model: Banshee Mk4 
• Caliber: .300 AAC Blackout 
• Action: Semi Auto 
• Capacity: 30+1 
• Barrel Length: 8" 
• Color/Finish: Coyote Tan 
   

Detailed Features 

• 8-inch threaded barrel for suppressor or muzzle device attachment 
• M-LOK handguard for accessory mounting 
• Picatinny rail for optics 
• Black RipBrace stabilizing brace included 
• Zeroed Grip included from factory

Owners of the CMMG Banshee Mk4 in .300 AAC Blackout tend to run it suppressed, and the 8-inch threaded barrel is the main reason. The short package handles well and the .300 BLK caliber performs well with subsonic loads through a can.

The RipBrace is functional but generates some debate. Shooters who prioritize a compact footprint accept it; others swap it out for their preferred stabilizer or configure the firearm differently depending on their local regulations.

The Coyote Tan finish and M-LOK handguard get positive marks. Build quality on the Banshee Mk4 is generally well-regarded, though some owners note the trigger is average out of the box and is typically among the first parts replaced.