While the intention was to solicit potential solutions which would be viable in the US, the results have been disappointing to say the least.
Many people outside of the US have posted regarding changes to US gun control laws, and/or changes to Constitution of the United States (specifically the 2nd Amendment). Those ideas might have the desired outcome in preventing or minimizing a future active shooter incident.
Unfortunately, many if not most of the suggested gun control changes are not viable suggestions within the context of the US legal and political systems, or US society generally.
To give people outside the US some perspective on how easy it is to amend the Constitution, there have been only 27 amendments made since the Constitution was ratified in 1788. Of these, only 26 amendments are in effect, since the the 18th Amendment (commonly known as Prohibition) was repealed by the 21st Amendment. Also, ten of these amenments (The Bill of Rights) were ratified together just over three years after the Constitution was ratified.
To an idea of the scope of an amendment, they deal in the rights of the citizens, government structure and government function. The 13th and 14th Amendments (passed in the aftermath of the American Civil War) which abolish slavery and involuntary servitude and defines citizenship respectively. The 25th Amendment codifies the line of Presidential succession.
In order for an amentment to pass, either a two-thirds majority vote from both the House and Senate which is then ratified by at least three-quarters of the States, or a Constitutional Convention needs to be held by Congress at the requested of at least two-thirds of the various State legislatures, and then the results of the Constitutional Convention need to ratified by a three-quarters vote of the States.
Basically IMO, in the next decade the Province of Quebec is more likely secede from Canada, or Australia is more likely to become a republic, than the 2nd Amendment to the Constitution is going to be repealed or further amended.
Until people understand that, absent a generational demographics change in US firearms ownership and use, a change which itself will likely take not merely decades but generations, these repeated recommendations on gun control which would require amending the Constitution, or outright recommendations to amend the Constitution are not helpful at all.
For those who have suggested that the laws are "just paper" one is speaking of altering the supreme law of the land in the US, which means there is a bit more to it than just paper...
Some things can be done regarding gun control, like introducing a ban on the sale of new semi-automatic rifles with certain barrel lengths, and/or banning new sales of detachable magazine with certain capacities, and other similar sorts of bans on new sales. It would be extremely difficult (and expensive) if not actually impossible to enact gun control laws which retroactively makes something illegal, and have the laws clear the Supreme Court without getting thrown out for violating one or more of the 2nd, 4th, 5th, 7th and 9th Amendments.
As for the suggestion to ban handguns/concealable firearms... Again, without repealing or altering the 2nd Amendment, such an outright ban cannot happen. The State of Illinois has lost recent legal arguments which they had been using for years to deny civilians the ability to own or carry concealed firearms/handguns, because the State was infringing on the rights of the citizens.
So again, keeping in mind recommendations need to be viable within the context of the US, do people have solutions? If not, then perhaps it would be better to close this thread.