I've stated in the other thread and in the comments that I feel that 90% of people calling for more gun control laws in America are just screaming "MORE GUN CONTROL!" without putting forth actual legislation ideas, or are just posting ignorant memes about "other countries don't have mass shootings, why is it so hard?" Meanwhile opponents say "There is no way to completely stop mass shootings with gun control, stop talking about it" like the Perfect Solutions Fallacy isn't a thing.
Let this thread be a place where we can put forth ideas for gun control legislation that you feel is feasible and would actually curb mass shootings and gun death in general, and to discuss these ideas. And no, repealing the Second Amendment is not a feasible nor reasonable solution.
I'll start with this: There is no good reason why any private citizen should own anything other than a handgun for personal defense, or a hunting rifle/shotgun for hunting. Semi-automatic rifles are unnecessary for anything other than recreation, and as has been recently proven, can be modified to be fully automatic, thus negating the ban on such weapons, while the ban against modifying rifles in such a way is unenforceable. There is a massive difference in damage capable of being done between a handgun and a fully-auto AK47. The "We need these guns for a functioning militia and so we can overthrow the government at need be" doesn't hold much water because you can't overthrow a government with access to drone, tanks, jets, etc. with untrained ground troops, and a land invasion of America will never happen.
However, a ban on these guns alone will not solve anything. An executive order and millions of dollars put into a collection task-force for these weapons will also be necessary, as well as Ammo regulations and greater tackling of the black market sale of such weapons. Such a program will not get all the weapons nor prevent all shootings from said weapons, but over time, it would help to reduce them. This would require commitment from Congress and the President but it is not outside the realm of possibility.