Go to
www.yardstore.com I am not sure of what he is using but I do that stuff for a living in aviation. You can get a 3x 4x or 5x rivet gun, I would stick with a 4x. Then you just need a bucking bar. Or you can buy what I have, a 3" squeezer, it works great and makes the bucktail look very nice. Or you can buy a table squeezer, which is what I bet he may be using. They have very deep throats and can squeeze a 5/32 rivet very easily and every bucktail will look the same. You can buy all your sheetmetal tools from those guys, your clecos, cleco pliers, rivet cutters, all kinds of cool shit.