they did a lot in 1968- according to what I've read (I'm 25, so I don't REALLY know what it was like to buy a gun as a 16yr old or open carry or buy through the mail, etcetera), and before that it was only full auto weapons and true machine guns
if they can nab semi auto then revolvers, pump and lever will be the new "ASSAULT" weapons to go after, then a handi-rifle will be an assault weapon..... remember the UN building in new york has a REVOLVER being twisted up on display, a statue actually. that's the artistic expression of destroying even sub-optimal handguns for the MIGHT of the UN with it's crushing, fascist GRASP. I don't know or feel that I know, that it will ever actually happen in AMERICA, though I'm not too sure this nation will survive my lifetime (guns might live on until the nation falls apart but how soon is THAT going to happen, maybe real soon, maybe another twenty years?).
the best question is why do they want to go after people that believe in god, have military service, have third party and libertarian views especially?! because religious people won't forgo ethics and decency in the name of the state, vets will not only recognize the divide and conquer but organize and fight it better, and the educated and motivated politically aware will have opinions and preach them- something lemmings aren't supposed to do. the UN wants to try something big, maybe destabilize america and step-up china to the number one spot, maybe crash america and make it dependent on china due to all the debt and inflation? that's my guess.