I have been looking at the SU-22 to add to my collection of 22's. So far I have a GSG-5, and 2 Ruger 10/22s. I have shot the Colt/Umarex M4 22lr and I didnt like it at all. The GSG-5 is awsome, and when I take it to the range I always get the "is that thing full auto" or "Is that a real can" comments. The main draw for me in the SU-22 is that I already have and SU-16, the black dog magazines and the E stock options. Any other advantages?