so what about this then?
May 10 2016
This is a brilliant idea, i think the falling to the ground after one shot in the vest would be very realistic
Edit: In reply to Ruthberg: I overlooked the 9mm part, but if you get hit by a bullet from an assault rifle or sniper rifle, then you certainly would fall back, and one doesn't always die if one has a good vest, proof in this video (skip to the part with the sniper at 02:30): http://www.youtube.com/watch?v=1dOAtZ6m3Bg
May 9 2016
lets face it, it doesn't matter.