So about a year ago I purchased my AR-10 directly from the manufacturer (BCA). I'm trying to send the rifle back to them to be serviced, the rifle with act like it's on safety (dead trigger )even if it's set to fire, I believe that the sear is hanging up and not releasing the hammer. I'm trying to send it back and they're saying that they can't service it unless I have proof of registration. Now to my knowledge AR-10'S are not regulated like AR-15's are, so I'm not going to have a 77r to pull up. It's a rifle so they don't exactly have to be registered,but I did get the lower through an FFL (blue fins in Dundalk) so in theory there is paperwork. But then do I talk to blue fins or the state police to get some sort of paperwork showing it's registered to me? Any advice would be well appreciated