Like I said, I don't blame the store but it can get out of hand. For example, the Gallagher .54 uses a cartridge without a primer - ignition is via a musket cap on a nipple. They did not have to do a background check for that gun. They will not deal with a MA FFL at all, and they will not ship an antique to MA.
But it all works out. Background checks are quick and painless. They have a good supply of antiques, repros, powder, caps, balls and bullets, enough to keep me coming back.