The Beretta Mx4 Storm is the military version of the Beretta Cx4 Stormpistol-caliber carbine. It has a barrel length of 12 inches, and is capable of automatic fire. The Mx4 can use pistol magazines, or its own 30-round magazine. There is an accessory rail on the top of the Mx4 for mounting scopes, laser aiming devices or flashlights. There is another rail underneath, forward of the trigger, for mounting vertical foregrips, laser aiming devices or flashlights. The Mx4, with a scope, is fairly accurate out to 100 meters, and automatic fire is accurate out to 200 meters. The Mx4 has a reputation, among the many police and security personnel who use it, of reliability and ease of use and handling.
India: February 14, 2011 an order for 34,377 carbines was placed by BSF( Border Security Force ) personnel. The guns were delivered in 2 batches : The first batch of 17,000 was delivered in September, 2011 and the second batch of 17,377 by March 30, 2012. In January 2012 BSF personnel found excess metal deposits, tool mark scratches, corrosion were found in 2,374 carbines and barrels of 4 carbines bulged when tested. On March 27, 2012 the Indian Home Ministry asked Beretta to replace 573 carbines. It blamed the defects in some of the other rifles due to improper cleaning and use of bad ammunition. Another order of 34,000 carbines were made. The total order of 68,377 Storm carbines amounts to Rs. 2504 crore(417.3 million US$).
Italy: In 2013, the Italian Navy (Comforsbarc) ordered 80 Beretta Mx4 Storm (for Euro 58.600) to be delivered in 2014.