I'm looking to compete in my first GSSF event this year (hopefully) and was wondering what modifications were legal and which ones are a violation. I have a custom backplate that I could easily switch out, but it fits my personality. I assume non-stock RSAs break the rules? What about grip plugs? I have a G30 and will be shooting subs and heavy metal (hoping to get a 17 for civilian or a 34 for competition) and am currently considering a tungsten RSA and stock 17lb spring, but don't know if all my practicing with it would be for naught in the competition. Any help? I know I could get a quick answer on that 'other' forum, but I'll hold off, I'm trying to break my addiction of them.