Yea they should get crits. But actually I think there is a hidden crit with the golden gun. Not for bosses, but for trash mobs. When I do the raid on hard, I can only kill hobgoblins in one shot if I shoot them in their weak spot. I have to shoot twice if I miss the weak spot. Apparently there's a damage boost in there somehow, but it doesn't show in yellow numbers. However when you shoot a boss with golden gun it doesn't matter where you shoot. Makes no sense to me