Best ranged build for a beginner comprising from Soldier, Shaman, nightblade and demolitionist classes?

Grim Dawn Classes, Skills and Builds
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A few, but if you wanted to dual wield guns then you needed to find gear that gave you that ability (still do if you don’t use Inquisitor as one of your masteries).

Have a look here and see if there are any ranged for the base game.