the federal government needs to step in and pass a set of bare minimum laws to keep things in check, and after that, leave it up to states to stick with those, or to expand on them as they see fit, but never to go below the federally prescribed minimum
(which would include THOROUGH background checks, and no one gives a fuck how long it takes, and the registration of that weapon, cutting out ALL person to person sales...if you want to sell a weapon, you have to do it through a dealer with a FFL, period. no ammo for weapons that aren't registered to you, no online ammo sales, NO ghost gun kits or parts, period, NO modified parts like bump stocks, and STIFF fines and sentences for allowing a child to come to harm because you have an improperly stored weapon in your home.)