The Beretta Mx4 Storm is the military version of the Beretta Cx4 Storm pistol-caliber carbine. It has a barrel length of 12 inches, and is capable of automatic fire. The Cx4 can use pistol magazines, or its own 30 round magazine. There is a rail on the top of the Cx4 for mounting scopes (day or night vision), laser aiming device or flashlight. There is another rail underneath, forward of the trigger, for mounting a grip, laser or flashlight. The Mx4, with a scope, is fairly accurate out to a hundred meters, and automatic fire is accurate out to 200 meters. The Cx4 has a reputation, among the many police and security personnel who use it, of reliability and ease of use and handling.