A Spell: Steampistol
Previously I had described a Steampistol usable by any druid with a Heat Metal spell. but what if Steampistol was a Druid Spell?
Steam Pistol
Druid 2
Duration: instantaneous
Range: 0
effect: allows user to fire a steampistol
The Weapon becomes a Divine Focus, the druid still must charge the weapon with a bullet (bullet option: normal-ignores leather armor/silver-lycanthrope killer/adamantium-ignores metal armor) and fill with water (preparing the weapon beforehand reduces cast time to a single round).
The weapon is still non magical - as is the shot (unless you use enchanted shot) but Steampistol becomes a proper spell.