I’m assuming the 21 age limit is still there. Grandfathering via certificate. No exceptions for anyone but law enforcement and military while on duty and federal concealed carry permits. Though I would assume that if it came down to it you could get a copy of you 4473 to prove you owned something down the road.. I’m not complying and I don’t know anyone else that is going to either. At least cops are bound by this law on their personal firearms. No exceptions for FFL holders either so theoretically the couple local gunshots would not be able to possess any of these firearms either.
I haven’t heard of any filed lawsuits yet but there has to be a few lawyers out there licking their lips.