Within the current iteration the following rules are in effect for Deyra:
Commonplace Guns: While still expensive and tricky to wield, early firearms are readily available. Instead of requiring the Exotic Weapon Proficiency feat, all firearms are martial weapons. Early firearms and their ammunition cost 25% of the amounts listed, but advanced firearms and their ammunition are still rare and cost the full price to purchase or craft. Modern Firearms are rarer still and cost 10x what they are listed as.
Special Ammunition: While bullets are much harder to specially make, specific ones have appeared. Any Arrow or Bolt variant may be turned into a bullet variant at GM discretion.