Since galvanized mods and weapon arcanes were a thing archguns struggle to compete with primaries as well as secondaries and are straight up not viable for the steel path.
But I love heavy armaments and certainly most of you do as well so I'm sure we are in agreement when I say that they deserve some love as well.
I have come up with some suggestions for an update so they could actually pack a punch but are still some what balanced. Please do let me know what you think of it and feel free to add any suggestions.
-Galvanized Focus: On Kill +50% crit. chance & crit. damage for 12 seconds when aiming stacks up to 3 times
-Galvanized Rounds: (Galvanized Chamber but for Archguns)
-Galvanized Aggression: (Needs a better name imo) +25% chance to apply [Blast] on critical hit. On Kill +20% direct damage per Blast Status affecting the target. Stacks up to 2x
-Piercing Fury: Critical hits have a 40% chance to ignore an enemies defenses (shields and armor)
-Primed Automatic Trigger: +90% fire rate
An Exilus Mod Slot should be added as primary and secondary weapons have one as well. This one should be reserved for mods regarding the ammo economy (e.g. recharge rate, max ammo, max magazine capacity and even the addition of a heavy ammo transmutation mod)
Perhaps there should also be Archgun Arcanes which then could conveniently be purchased from Father in Necralisk. No ideas there, I'll just leave that up to you.
My next idea may not suit most players liking as Warframe is very fast paced but I believe that Archguns should really be treated like proper heavy guns, heavily impacting mobility (Slower movement speed, no shooting while sprinting, no aim gliding, no double jump / bullet jump)
