The M2 Browning is an automatic premium gun unlocked at rank 6. It costs 2,000 mochi coins ($2.99 on the ipod/iphone version). Ammunition for this weapon costs $750 for 250 rounds. This gun is best used in onslaught. It can kill any zombie (excluding the devastator) in seconds (in normal mode). High rate of fire and big damage means lots of zombie killing. The main thing about this gun is that it swaps its mobility with the gun's high fire rate, the magazine (ammo) capicility and the large amount of damage. This will get you a load of exp and complete games in mere minutes, BUT you need to watch your back if this becomes your primary and watch your mag because the ammo often goes quicker than expected. Don't let this deter you though, as this is more economic than other MGs due to higher damage and pierce per shot. Overall it's an awesome gun with high power, great fire-rate, good pierce of 7, and epic range, but poor mobility and a slow reload. Great as a last resort. The guns ammo price is high, so don't use it alot if you don't have alot of money, otherwise, if you have over atleast 200,000 then your fine.