Gunsmith, Gunslinger.

You are adept at using guns effectively.

• You gain proficiency with Firearms.
• If you roll a misfire on an attack with a firearm, you can use your reaction to roll a d20. If the number rolled is higher than the weapon’s misfire score, the firearm does not misfire. You cannot use this feature of this feat again until you complete a short or long rest.
• When you use the Attack action and attack with a one-handed weapon, you can use a bonus action to attack with a loaded firearm with the light property you are holding.
• Gunsmith: you gain proficiency with Tinker’s Tools. You may use them to craft ammunition at half the cost, repair damaged firearms, or even draft and create new ones (DM’s discretion). Some extremely experimental and intricate firearms are only available through crafting.