A spellslinger can cast any ranged touch attack, cone, line, or ray spells through his arcane gun. When he casts through the arcane gun, the gun’s enhancement bonus (if any) is a bonus to the spell’s attack rolls or to the spell’s saving throw DCs.
So could he use the spell-like abilities from his school of magic through his gun?
I also thought of the fun idea of using Evocation / Generation's Wind Servant to fire unattended objects using his weapon.
Unfortunately, SLAs are not spells, so no.