Quote History Quoted:
Yes, SN is required of manufacturer.
View Quote
True, if it was a real licensed manufacturer. Cannot be a US manufacturer w/o a license.
In-state private sale (or gift) of a 80% that was made by an individual, does not need a SN. Straw-man 80's (or anything) will likely end badly.
If the 1st maker was a real FFL licensed manufacturer, then the item should of had all the required markings that a FFL licensed manufacturer is required to do. It would have also gone via 4473.
I see some are suggesting to look for a SN, but if it was a real licensed manufacturer who made it, it would have more than just a SN.
OP, did the company you got it from claim to be a dealer, importer, or manufacturer?
Well OP, should have never posted here to start with. You could of had an 80 and all would have been ok. Now that you have given details, you are in a sinking boat. Did you fill out a 4473? Even with a good 4473 I am not sure what the ATF would do with that lower, they'd probably just take it from you. If there is no 4473, then I would perhaps surrender that lower to an ATF office, and I am sure they will have lots of questions. Or, keep it quietly and understand the consequences of having such.
Are you OP sure it wasn't an 80 that someone had done, and they then decided to sell it to you?