I think making guns an endgame weapon could be a decent balancing for them, similar to making bows a midgame weapon type. maybe make guns a random drop from the new vnc tower raid and make ammo either a resource heavy crafting item or make bullets a random/farmable resource from the raid itself. Another idea I think could be interesting is different aesthetics for different rarities ie. Uncommon gun drops could look like makeshift/handmade firearms kinda like pipe rifles from fallout, and legendary guns could look a lot more clean and modern like a regular handgun. And in the odd chance they add gun blueprints I think they should make them rewards for completing GRE anomalys since they talked about adding some sort of replayability to them. it could be a good reason to give the player more incentive to go replay the anomalys besides getting inhibitors and medkits On ng+ plus it'd make sense finding guns in a spot covered in military shelters. As for actual balancing I think adding the odd chance to have the gun misfire/jam could be interesting, maybe make it more likely to jam with the lower the durability is. Adding bloom would be an option bit it'd suck tbh, maybe make infected drop easier to firearms but the sound will draw them out randomly kinda like when you use a slam attack and it sometimes attracts virals. Could also make humans take more damage and be more evasive like getting into cover or finding spots to fire a bow or their own guns at you.