The current damage model in this is atrocious. Honestly it was better in the closed alpha where it took like six shots to kill someone with an M16, because at least it made sense back then. Now it's just silly. All 5.56 NATO and 7.62x39mm rifles (with the exception of carbines) take two shots to the chest to kill regardless of whether the target has light, heavy, or no armor. If you haven't seen it, FreedN and Whitby tested all the guns and made a chart of it. I've done testing on only some of this stuff, but I can tell you that I came up with the same results as they did.
https://forums.focus-home.com/topic/32770/dmg-values-are-broken-needs-fixing-asap?page=1
What I see needs to be done is this:
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All 5.56 and 7.62 rifles should kill in one shot to the chest with no armor.
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Actually give a physical model for the armor so that it matches what you see them wearing. It seems like currently armor is just "X% of damage to chest reduced if wearing armor". This means shots to the sides and below the neck are still absorbed by armor even though you can't see any there.
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Rather than armor reducing a certain percent of damage, armor should reduce all or almost all damage until it breaks after a few shots, rendering it useless.
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Remove back protection for light armor.
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Give light and heavy armor the same level of protection from a shot. The difference between the two should be that heavy armor protects the lower chest and back, which is how it appears on players in-game. Part of the current problem with armor is when everything (with the exception of the Makarov) kills in three shots or less at close range, and you have many different calibers, it is difficult to balance three levels of protection.