Not just Philadelphia though.
Any major metro US city this carp is every night.
I’d bet big $ not a single one of those firearms are legally owned by those perpetrators.
Easy bet. Very few gun crimes are committed with legally owned guns. But I will say, in 2020, when the mobs were vandalizing CNN's headquarters in Atlanta, the though occurred to me that, since I hate CNN, and since I'm roughly an hour and a half away, I could zip up there, unload a few 30 round mags into the building façade, and probably get away with it. Of course, the sun was down, so it goes without saying that I was drinking, but at 61 (then) even I had sense enough to know not to take action.