Pistol Using Build

[JoshuaNLG]

I'm looking to create a dual pistol using watcher for my first playthrough, specifically sticking to ranged only, I'm unsure on which classes suit this playstyle better, the ranger has Gunner, but seems most of the other passives are tailored towards the pet, devoted seems good if i specialize in pistol, most of the actives seem a bit un-needed other than disciplined strikes(is that it?) and one of the stances that gives accuracy i think.

 

Would a good combo be an Assassin/Devoted?