Luigi Mangione

One of the cops in PA could have had one in his house before the shooting, is what I'm saying. Maybe this isn't the first gun those specific cops have planted, even. Maybe it was, and a cop saw the shooting and said "hey I have a printed glock at home, I could grab that and find a similar enough looking guy and make a name for myself." Maybe (again) the cop didn't print it, they took it from someone who did and didn't report it, saving it to plant on someone later.

Is it likely? Probably not, but it could happen. I do literally know a cop who used to take cool guns home and not charge people with having them, I don't see why it couldn't happen again +planting.