TeamFortress2 Info
The armor in TF2 is based on stopping power and how much you have. The thicker the armor the more you'll stop certain weapons. There are 3 types of armor light medium and heavy. For example a ranger's sub machine gun can penetrate light armor fairly easily so it only absorbs 10%-20%,
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I can however confirm that these screenshots are from TeamFortress2. I imagine a lot has changed since those shots though.