Yes, its a paint stripper type hot air gun. If you keep turning the shank it will not harm the bark in anyway. If your not sure, you can wrap a bit of tinfoil around the shank area being heated.
A lot of people are buying straight grain timber handpieces, such as crooks, but its really a waste of money, as soon as you drop it or put any strain on it, it will easily snap. Only work with one piece Shank-handpiece, or use a burr. Far stronger, and not likely to snap.
Take a look at this site. Tell Martin what you want and he will do his best to get it for you.
http://www.highlandhorn.com/