After making this thread, I stumbled onto a few VERY informative posts in the conversion/tech forum. According to the Tromix guys, Tony moves the entire gas system 2" rearward for guns in the 11"+ range, and 3.75" rearward for the 8-10" guns. For my application (12"), it looks fairly straight-forward and nowhere near as complicated as I was making it out to be. My main problem being, I don't have access to a machine shop, so, I'll have to send the barrel and gas system out for the mods or find a local machine shop and guide them through what I want; everything else I can handle.
So, for