I purchased a Winchester 1300 defender and the guy I bought it from said that it is a registered pistol in Michigan. I/ has an 18 inch barrel and has a pistolgrip no stock. I filled out the rio-60 but I dont believe it is a pistol. Can I have it unregistered? I'm totally unsure. Do I have to turn in my Rio-60? I only have a michigan cpl so well you know . Can I get some opinions?