Yes, Machinist uses Rifles as their weapon.

But their entire class fantasy is about being an Engineer that summons/uses gadgets in battle. Not necessarily about the Guns themselves.

Watching Merlwyb in the Melee DPS role quest made me realize just how much I really want to see a Gun class that is all about the Guns and Ammo.

Hell, if you wanna give it a twist, make it a Magical Ranged DPS where instead of Ammo you shoot various aspected Aether. Magic Guns.