Nog Blaster = maybe reskin projectile? dunno cuz it's slightly bland.

Piggy Banker = "oink sound" upon detonation.

Buccaneer Broadsider = reskin projectiles to round shots? like irl old muzzleloaders.

Caladbolg = it's charge blast would be cooler if it's rainbow colored.

Owlite Wand = maybe change the sound it makes when shooting? sound's wierd with gun sounds, also... reskin projectile?

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Others:

Illuminating Ward = Would be better if it's held like power mitt and teddy buckler instead of hiding on the rear while on haven?