I should not have put Scott (sorry about that Scott) on the spot about the extension and just gone and looked myself. Here is a link to the Graco page that shows two extensions.
http://www.graco.com/us/en/products/contractor/proshot-ii-cordless.html
The first generation hand held were blow and go, I used one but never owned one. Could not see the advantage to them.
I have the Fine Finish gun which is 3-4 generations removed form the one Scott first tested and the one I used years ago. With practice this gun should work for applying a good finish on casework.
The handheld for finish is never my first choice. I got it because I had a run of painted cabinets to do.
Tom