We already have one; you know that Super Good Advice is a gatling gun right?
Three barrels, a magazine capacity of 200 rounds with no reserve ammo, and the ability to fire endlessly: definitely a gatling gun.
Its even a solar type weapon.
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Ok but what is problem if we can have more guns?.....do we have a lmg with explosiv rounds?
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Nope, its not a perk present in the MG perk tree.