I’m a M5 hater, I thought the M80A1 penetrated Level IV. I guess not!Change the bullets core to tungsten. I believe some WW2 surplus tungsten German 8mm rounds that weigh about 173 hrs can be found and have a dramatic affect on level four body armor. Now they could do the same with a 7.62x51 and not have to change anything. I think they already have them in stock for 7.62x51 & 5.56x45 AP. Improve the ammo is cheaper than any new play pretty.