Absolutely, people have said ban all guns in this thread. Didn't find it with a quick search, but it has certainly been said.
And this kid spent $2k on this arsenals that he didn't even use 10% of. Make them much more expensive than that and you are just encouraging a black market.
If you don't remove most of the guns you simply haven't restricted access to them. People will still need guns to defend themselves criminals with guns. So keeping them in a locked safe at all times is not an option and will never happen.
I fully support raising the age of buying firearms. Have said so several times in this very thread. I've actually proposed this as well.
I fully support preventing dangerous people from buying firearms. Have also said so many times in this thread.
Universal background checks will never happen, even if we can get the republicans to allow a bill to go up for vote in the senate, and it somehow passes, MAGA states will not enforce it, as we've seen over and over. They will undermine gun control until it's not successful and it will be sunsetted or voted out.
I am advocating that we spend our time and effort on stuff that could actually make a difference.