Somewhere around 180 mph. Which would still be more than enough to dig it into the floor.

Why are YOU arguing about this anyway? Are you trying to say it WAS a fluke that some dimwit just happened to shoot off a gun at precisely the right angle and distance to hit THAT PARTICULAR WINDOW... at all?

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SGT. JIRI TREBISSKY H&D SAS

"When the winds of change blow, some people
build walls and others build windmills."
~ Chinese proverb