Funny, bury them in paperwork. Have those guns transfered so many times they won’t know who owns what.
Then, of course, there’s always that paperwork that you can file on 50 different guns (with fake serial numbers) that exist a 50 different addresses, including the local baseball/football/basketball/hockey stadium, city hall, the mayor’s house, the local DNC headquarters, the local (anti-gun) paper, your (least) favorite anti-gun neighbor, etc. I understand that this was done a lot in Canada, and that the gun owners made the system run out of money. We have 100 million+ gun owners - just saying.