4-5 million belong to the NRA, and that is just one of many 2nd Amend. groups. There are 60,000,000 acknowledged guns owned in the US and that does not include the ones in states and localities that do not have registration. There could be millions more. No small group of elites in DC is going to significantly change most gun law not already in place already.
Lanza was denied a rifle he tried to buy. He shot up the school in Newtow with a stolen weapon. He was likely mentally ill or emotionally disturbed (killed his own mother), and no law proposed today would have stopped that terrible massacre in a gun-free zone.
And Biden is as stupid as person to give to oversee something like new gun laws as my dog's left foot.