Yeah, GTA 4 was great with that. I actually tried to destroy the windshield with gunfire without blowing up the car and it is impossible. Even when you don't blow the car up, weapons fire will never destroy the windshield.
If the car rolls though it may break. The cover system in general didn't factor in what guns can penetrate. You can take cover behind a cardboard box and you'll be okay.
I wish GTA 4 had more guns, it gets boring with the typical selection after a while.
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