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One potential problem with "through the door" lies in what is inside the door. Virtually all doors have a window regulator of some type, some have steel "impact" bars for passenger safety, there are assorted actuators, rods, electric motors, speakers, etc...that could impede or influence bullet travel.

Only the windshield glass on vehicles is laminated (tough). Others are tempered glass which shatters into small beads upon impact. While it is true that some glass may come back at you, it will be on the first shot only.

My first choice would be through the window glass, but I will happily try the door if the situation calls for it.

Just my .02

Have a great day all.