Sniping is an easy fix; change sniper rifles so that they do 75 damage up close for the bolt action rifles with no damage multiplier except for headshots(still yields a one hit kill to the head, 2 shots elsewhere) and 30 damage up close for the semi automatic rifles up close.
C4 is balanced because you can wear a Flak Jacket and be immune to C4 + all other explosives unless you get hit like 4 times. I'll concede that the throw distance could be a bit shorter.
macarena69 posted... "That's the point. I can do it, you can't stop me, I gain nothing from listening to you, come on me bro"