Maybe but as I've just bought the gun in this condition I want to get the things out so I can see what's going on. I know it's probably just a buildup of crud but I need to satisfy myself that the previous owner just couldn't be bothered to clean the backplate after a session, if that's what your supposed to do, or whether the bushings have worn out. The gun itself is great, doesn't seem to have done much work and it was clean, clean as a whistle when I bought it so this backplate business is a bit odd. I still don't know if the pins should be spring loaded or not, I'm guessing they should..
Remember, it is the strongest character that God gives the most challenges.