At the state level we have many examples of this actually happening.
California passed an "assault weapons" ban 1989, and in an act of amazing bureaucratic/political gymnastics first said a particular obsolete WWII rifle design, the SKS which has an integral 10 round magazine and a medium power round, was OK but you've got to register it, then reversed and decided they were illegal, and for anyone who registered one....
Keeping with the old gun designs issue, let's say you live in NY state and own a "Keep Off My Lawn" WWII era M1 Garand rifle, which has an integral magazine and is fed with an 8 round "en-bloc" clip. Well, now, outside of certain types of competitions you can no longer use those clips, you'd have to carefully bend sheet metal to reduce them to 7 rounds and likely suffer reliability problems. I carry a pre-WWI M1911 design handgun, with modern 8 round magazines; if I lived in NY state, I'd be a felon if I missed unloading one of them by one round.
There are many many other examples of these state and local "flypaper" laws and their enforcement.
California passed an "assault weapons" ban 1989, and in an act of amazing bureaucratic/political gymnastics first said a particular obsolete WWII rifle design, the SKS which has an integral 10 round magazine and a medium power round, was OK but you've got to register it, then reversed and decided they were illegal, and for anyone who registered one....
Keeping with the old gun designs issue, let's say you live in NY state and own a "Keep Off My Lawn" WWII era M1 Garand rifle, which has an integral magazine and is fed with an 8 round "en-bloc" clip. Well, now, outside of certain types of competitions you can no longer use those clips, you'd have to carefully bend sheet metal to reduce them to 7 rounds and likely suffer reliability problems. I carry a pre-WWI M1911 design handgun, with modern 8 round magazines; if I lived in NY state, I'd be a felon if I missed unloading one of them by one round.
There are many many other examples of these state and local "flypaper" laws and their enforcement.