This shotshell carrier system, offered in four and six shell configurations, is machined from aircraft aluminum and features an integrated receiver length aluminum Picatinny rail to support mounting optics, lasers or other accessories. Mesa Tactical, designer and manufacturer of high quality tactical accessories and equipment for law enforcement, military and civilian shooters, has introduced a new SureShell ® Shotshell Carrier for the Beretta 1301 Shotgun.