Was there any weapon caliber revealed?
I read a 9mm.
9mm and I heard 15 shots in the video. So I am guessing 2 mags were used (as there was a 4-5 pause between the first initial 8 rounds fired) or it was a high capacity 9mm Glock.
Pretty clearly a hammerless Glock. It looks a bit largish in the murderer's hand, so there's a good chance it's a large-frame .45 Glock 21 or 10mm Glock 20.
The autopsies indicated fatal hits to the head and torso of both TV station victims, according to the New York Times. That sort of indicates he finished his indicated victims off with *certainty* headshots, but did not do so to interviewee Vicky Gardiner, who was injured badly enough.