Either way, I'm guessing the AGM is going to try and tell you that "it's unnecessary to your shopping" and that that's just the way their policy is. Probably a lot like how Costco puts it. Maybe keep it to an email so that you can explain your viewpoint better (and not be going back and forth on the phone). You could also mention you'd like the discussion kept on email so that you can pass along the regs to other gun owners so that they can be informed/possibly shop elsewhere (without turning it into a threat that you'll shop elsewhere). My 2c.