Right, it won't matter and since you've preregistered and your stickers will be pre-printed, there is no real need to bother telling GSSF. You can tell the Scorekeeper RO up at the line as a courtesy, and they may scribble it down... but GSSF doesn't care as long as the pistol is legal in the Division you are shooting (and that's up to the CRO to confirm). Last year, Lisa Marie and I gave out the stickers for those who were pre-registered so it was unnecessary to even see or speak with GSSF folks before shooting. True... may as well bring the 17 and see how that shakes out. With a $10,000 cash deposit or bond, and if you'll wear an ankle bracelet, I could lend you 3 G17 mags. Find me there... tall, pony tail, wearing a blue RO shirt, and probably a Smurf gun on my side.