I think it will result in an increase in gun sales, like all the other times gun restrictions were being pushed by the government (and other lackeys of the owner class).
Second Amendment
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
Advocates for tighter gun restrictions in Pennsylvania seized on the shooting to urge state lawmakers to pass bills already introduced into the state legislature that would expand background checks, temporarily remove guns from potentially dangerous people and raise the minimum age to purchase rifles similar to the one used in the attack to 21 from 18.