WebSnyper,
Thanks!. That should work great since I have the small rail on the gas block. Since the rail is on the top of the gas block, I wasn't seeing how to make this work. But this side attachment should work just fine.
There are a couple of different varieties of those out there (or at least there was) when I bought mine. I'll have to take a look and see exactly which one I have. I think I have mine currently on my S&W 15-22, and allows me to move my sling from my regular AR to my 15-22 with a QD swivel.