Agreed, this was almost assuredly handguns, which should be the focus, but those that want change are too weak even to suggest handguns be restricted.
Drastic changes must be made to combat violence, so let's counter with greater violence. All infractions that involve a firearm result in immediate execution. From the obvious crime of homicide down to carrying a gun and getting caught speeding.
The only exceptions are nonviolent offenders with registered guns and a personalized security feature. ( facial or fingerprint recognition etc) Those that are executed are taken to the local rendering facility and disposed of along with their weapon. Lets try this for 5 years and review data to see if there is a positive impact on gun violence.