A Glock 43x/48/26 have standard 10 rd 9mm mags. G19 has 15 rd. G17 has 17 rd. The smaller G43 is 6 rd. Absent the model info, it is likely one of the 10 rd standard models.
So he emptied his gun. Good.
I’m curious as to what the inherent accuracy (precision?) of the weapon is. If it is clamped for sighting and fired 10 times at a target 40 yards away, what will the grouping be?
My guess is that Providence AND skill played a role in the first shot at least, then Dicken was able to move in closer to the perp.