Do you only work with steel in gunsmithing? If that is the case look at the Miller Maxstar 150 STH/STL. They are DC only, run off 115 or 220v, around 15lbs and ridiculously small. They run new around 1.5k including everything but the bottle (fingertip amperage control). If you find one used, make sure it's under warranty because the pc boards are expensive if something goes wrong...course of thought for any inverter based box.
The Dynasty is a great machine and can do anything. However, it's expensive and may be more than you would ever need with your gunsmithing. That being said, a TIG rig is a considerable investment and always better to buy into a bit more than you think you'll need because it's much easier to have the needed features already at hand then to add them later on.
