IMO the PD should be looking for 2 hand guns. One 40 cal, and I am not sure why they are zeroing in on Glock... Unless there are charistic extractor marks on cases... There are many brands of handguns that shoot 40. The other gun I would suggest is another handgun, likely a .25 or .380. I think this crime was most probably done by 2 shooters, firing at nearly the same time.