M82, for being top tier sniper, needs higher magnification. Also, what the hell? WHy nerf the vehicle damage? The main point of the gun is that it does 800 damage, so it can neutralize vehicles. Now it does the same as every other gun? Why?
Well, once you get an assistant and pair the Famas and M4, you breeze through the levels. Once you pair the PKM and the M249...it's hard to lose. You would probably have to avoid firing the whole round to lose. Also, a tip: Get shooting effectiveness up to 100, because the survivors at that point start to shoot as soon as zombies are visible and usually make one shot kills.