One way you can shoot out a window would be if it is straight on it and didn;t "glance" off. That would be why a car window would/wouldn't break because they are commonly at about 45 degree angles. The side windows on the other hand could maybe be broken because they were designed to a weaker standard due to not needing to be as resitant to a force. Correct me if I am wrong but if you shoot anything that the bb will glance off of you should be perfectly fine.
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