With a democratic congress, it would mean the end of civilian firearms ownership in the USA, gun registration first confiscation next, even Duck assault shotguns. Maybe we could keep our pellet guns and .22's as long as we were members of a gun club and could store them there and show that we were involved in competition.
All semi autos would be banned first, The centerfire rifles next, then finally everything else. Oh and handguns of course, the clear choice of crimminals and murderers, would be banned after the assualt weapons.