Came across a very old Mauser P-08, 9mm Luger, And I found out my Grandfather after he came back from WWII bought it off a friend. He never got it registered to him. And it was told to me that it was never registered in anyone name before. Now knowing all of this, is there a way that I could get it registered in my name? What steps if any can I take to register this in my name?