I'm not sure exactly how it works in 1.1.0.4, but in a previous version, at 100 armour it would take 41% of the damage from a bullet/grenade/knife.
At 50 armour, it would take 20-21% of the damage from a bulllet.
Of course, I'm not sure what the statistics are for this version.
At 50 armour, it would take 20-21% of the damage from a bulllet.
Of course, I'm not sure what the statistics are for this version.