Welcome to KTOG Oleg. You are more than welcome here any time. That's a nice little rifle you got there. I sure wish I could find one around here. Anyway, I'll move this over to the SU forum where you intended. Have fun and stop by out new RTKBA forum.
Another KTOG welcome! When I was Googling the SU22, I came across a pic of Oleg shooting a practical rifle match using a waay tricked-out SU16--it took me a moment to recognize the SU under all the accessories. Please post it in the "Pics of Your SU16" thread; the SU fanboys here will love it! Also, how well does the SU hold up to competition? There have been some questions about the rifle's durability.
Basically, SU16CA was a bit hard to balance with a heavy can on the front. It needed a shorter stock and a pistol grip...hmmm, that sounds just like the newest Keltec variant to me! The one I have on hand now solved the complaints I had from that class.