Just when you think you've seen it all, you haven't. You can convert your 10/22 to fire 95 grn missles, at 425 fps, for deer hunting. Shoots 1" groups at 50 yds. Check this out: http://www.swivelmachine.com/html/rimfire.htm
I can see a good use here for that. Our animal control office shoots a 10/22 that I build for the department. In some cases the dart gun would come in really handy. Otherwise, to me, at least, its just a toy. Although it is really neat looking..........You can also use it as a tranqualizer gun