[Autumn]

Snipe would be iffy, as then every sniper rifle gets the round 0 threat, but the hit bonus at the very least should apply.

As for archer skills, I can see Keyshot applying as Archer gets no inherent crit buffs for guns, and for being a basic attack centric weapon they really do get shafted on crit a whole lot.

Giving guns more utility is a dangerous proposition simply because they're already the kings of utility with Magic Gunner's single shell effects.