http://www.doskosport.com/ It is Shotforce Shotshell Holder; this is a tactical Shotshell holder that will fit all ATI 6 Position Collapsible Stocks for the boost in ammo capacity. Now you can have the convenience of carrying additional ammo for your shotgun; this shotshell holder has a capacity to hold 5 additional 12 Gauge shells. One feature that we love is that Shotforce Shotshell Holder is ambidextrous which makes it ideal for both right and even left handed shooters.