I have a pretty useless 20 ga single shot shotgun that cost me about $100 NIB. I was going to get rid of it, but then I thought about using it as a "close-in" gun for when I'm calling coyotes. Seems like it would the perfect candidate for shortening to 26" overall length, with an 18" barrel. Of course, I would make sure to leave a half inch or so margin of error on both measurements so as not to incur the wrath of the BATF. I can't find where there are any state regulations that would apply to these measurements. Does anybody here know of any?