I have had a polish under folder for 10 years. It has sat in the safe unfired and in perfect condition for a longtime. I took it to a gun-show to sell it to buy something else I could shoot. And 5 different people told me the thing was ILLEGAL cause of no serial number on the lower. I bought this from a dealer and did a 4473 on the rifle. It has a large serial in the trunnion. How do I make this a sell-able rifle or do I just have to keep it? I do know a number is supposed to be on the receiver but just never though about it since I bought it from a dealer. If this question in misplaced on this forum let me know.