Your mod is awesome btw! :D
Some gun suggestions:
Throwing Knives - Pretty self explanatory, throws a screwdriver in a line. Consumes 1 Bolt per shot.
Double super disc gun - 10 Discs instead 5. 10 Ammo consumed per shot.
Circle Slugger- Shoots 8 slugger shots in a circle around the player, Consumes 8 shells. Decently long reload time.
Director Circle Slugger
Frisbee Gun - Same as the yoyo gun just longer range, doesnt bounce, if it hits a wall it doesn't return to the player, pierces enemies.
Super Frisbee Gun - Same as the frisbee gun just shoots 5 frisbees.
Paintball gun - This weapon might be a little hard to do, but this gun is rare but almost totally useless, does 0.5 damage, semi-auto fast reload, when you shoot enemies or walls it changes the color of them to a random color.
Anyway hope you consider these, once again love your mod super awesome.