I've heard that the free floating firing pin can cause slam fires, and that it's a good idea to replace it with the spring firing pin. They run for $37 with shipping to Canada from here: http://www.murraysguns.com/sksown.htm
I just thought for $37 it would be a little safer. I'm also thinking to replace the original springs with the Wolf spring kit to improve the trigger pull on it a little bit too. Any thought's on the Wolf spring kits?