The American Milsim guys are at the SHOT Show 2013 and they caught this prototype at the Elite Force/Umarex Booth which we made us curious too. It's a BB loader prototype designed to ease your life in loading low to mid-caps which don't have those doors seen in high capacity magazines. Whilst this is larger than the other BB loaders and the one designed by Tokyo Marui for their new gen magazine, it seems designed to fill up your mag under one go. Anything that makes refilling easier is welcome.