Spellock Firearms

Black powder and flintlock weaponry have been around for ages, but recent inventions have allowed magicians to create their own form of firearms. They fire a variety of projectiles, most of which are just offensive elemental spells condensed into a bullet so it doesn't drain any of the user's solar energy. This also allows for nonmagic users to "cast" spells, and created a brand new private market for wizards and craftsmen alike.
  The firearms work much like a wheellock gun from the modern 16th century. A small while of steel, often embued with magical runes) spins and strikes a piece of iron pyrite oxide, creating sparks. The sparks then activate the spellshell and it is fired down the barrel. Most spellock arms are muzzleloaders and must be primed after every shot. The shells leave behind a black tar-like residue that must be cleaned regularly or the spells may misfire and injure the user. During the eclipse, spellocks can become incredibly powerful, although the chance of a violent misfire increases as well.
  The different spells are contained in spellshells (or just shells for short) and look like all metal shotgun shells. Most shells are wrapped in parchment with glyphs that assist in the spell being cast and often ignite to start the spell like a percussion cap. The shell is filled with a whale oil potion, spell ingredients, and a projectile if necessary. 
  The most common spellshell is called a Thrasher, which fires the metal shell as a spinning blade of molten metal at its target. The unfortunate target is then hit with not only a firey shotgun blast, but the metal shards searing onto their flesh. Most of the other spellshells are condensed elemental spells, allowing the gun to fire bolts of lighting, fireballs, magical vines, or fire a transformation spell to turn the victim into a sheep or some other animal. Because of the wide variety of ammo types, many people simply name the type of shot after the sound it makes. Lighting spells are Cracklers, Fire spells are Boomers, and wind spells (used to clear the deck of a ship with a massive gust of wind) are Gusters.
  The design of the gun shows which type of shot it is built for. Lighting guns are long and thin, while more brutal thrashers look short and heavy. Some guns have multiple barrels for more than one shot or two wildly different barrels for versatility. The newest models have begun incorporating rotating barrels, breechloading mechanisms, or revolving cylinders to deliver more firepower per second.