Hardly any players use the KA-M and I think its damage output is to blame. In the real world 7.62x39mm does more damage to flesh/ballistic gel than 5.56x45mm because 7.62 moves slower with more weight behind it, causing the bullet to expand and unload all of that energy into the target. 5.56 goes faster but with less weight and should obviously not do more damage, a lot of the time 5.56 will pass through with minimal damage to flesh. The physics just don't add up. The KA-M should have an output of at least 105 health damage, the SK should do 115, and the LAR should be 130, to even things out.