"Red states fault..."
-Chicago Mayor Brandon Jonson
He isn't necessarily wrong in that the guns and ammo are mostly coming from states with lax gun laws.
Less than half the guns used in Illinois crime come from Illinois, data analysis shows
New data analyzed by the ABC7 I-Team found less than half of all guns used in crimes in Illinois came from Illinois.
Understanding Underground Gun Markets - University of Chicago Crime Lab
The Crime Lab explored how people access firearms and ammunition in the illicit market.
This solution, though, makes little sense.