Total civil disobedience, zero compliance with an EO, not a single gun registered or turned in; your move Zero.
I was thinking that some time this year I’ll invest in a bit of rebar and rustoleum. Then when I’m down at my shooting property I’ll cut the rebar into rifle weight sections, coat them with rustoleum and bury them at random locations on the 60 acre property. Then if I ever do feel the need to bury a cache, any curious feds will have a merry game of needle in a haystack.