Editor’s Note: The CMMG FourSix Banshee brings the 4.6x30mm cartridge from the MP7 into the world of AR-15 pistol-caliber carbines. The 4.6x30mm is a small and lightweight cartridge with extremely low recoil, comparable to the 5.7x28mm round. The FourSix boasts an impressive 40-round capacity and gives users all the modularity that comes with the AR-15 platform. This gun features fully ambidextrous controls and a complete set of upgraded ZEROED furniture and controls, and a includes a linear compensator.