The thing here is that the purchase laws worked as required. This nutcase went into a gun store and was told that he couldn't get a gun because for the mandatory delay and investigation that is required for a gun purchase.He didn't want to wait. So he murdered his mom and stole her guns. Really, that part doesn't seem like a gun control issue to me; criminals will always get guns through illegal methods such as theft and murder.
We could argue that guns shouldn't exist in the first place, but they do and they aren't going anywhere soon. There certainly isn't enough support for a constitutional amendment.
Instead, let's talk about the assault weapon ban, because it had a key point. Basically, it didn't reduce gun violence, for the simple reason that, as stated above, criminals don't go into gun shops to buy guns.
But one thing it did do was, in general, limit the cartridges for semi-automatics to a maximum of 10 rounds. That might have helped dramatically in CT. Or it might have made little difference. We'll never know. But I'd cetainly support reinstituting a limit on rounds in a semi-automatic cartridge. If it just reduces the murders in a mass-murder situation, that's at least something positive.