Thanks for talking me off the ledge...all this started because I thought I wanted to buy another Wildcat, but a Mk III in .30 cal. I was concerned about the longer barrel and POI change because I tend to be less than gentle with my guns...I asked around about where to find a barrel band and a kind fellow member offered to sell me a SMW band for the cost of shipping, so I did. Then I changed my mind and decided to go for an Impact. Well, the SMW barrel band doesn't work with my original MkI Wildcat without a plenum extension or mods to the stock...so now here I am. At least it wasn't an expensive endeavor. Too much time on my hands and none spent on research!
Thanks to everybody for the feedback!