Inventor

Some gunslingers take pride in the art of crafting, rather than shooting. They are adept at creating guns and modifications, often doing so on the fly with minimal resources available to them. Inventors often walk around with eccentric weapons modded to the absolute limit. Inventors are paragons of ingenuity and creativity.

Crafter

At 3rd level, you can craft any firearm during a short or long rest with just your tinker's tools. Additionally, you can add, remove, or swap modifications by spending only 10 minutes of downtime, and there is no limit to the amount of modifications you can add, remove, or swap during this time. You may also swap one of your learned modifications for a different modification after a long rest.

Additionally, you have advantage on your tinker's tools check to repair a weapon that misfired, you learn 2 additional modifications, and can have 1 additional weapon modified at once.

Master Modifier

At 7th level, you can add two different modifications from the same modification category to the same weapon. You may also ignore weapon property restrictions on modifications.

Rapid Construction

At 10th level, pick 3 modifications that you know. You study these modifications, learning their intricacies like the back of your hand. Once per turn you can use a bonus action to either add or remove one of these modifications on one of your guns. If you choose to remove one of the modifications, you can swap it with another one of these 3 modifications.

You can change the 3 chosen modifications after you finish a long rest.

Repairman

At 15th level, you automatically succeed checks to repair a misfired weapon. Additionally, once per short rest, you may ignore a misfire and treat it as just a miss. You can spend 2 exertion points to use this feature again if you have already used it.

Master Builder

At 18th level, there is no longer a limit on how many firearms you can modify at once. You can use your bonus action to rapidly assemble an entire firearm, complete with modifications, or you can add or remove any number of modifications to an existing gun.

Additionally, you have developed blueprints for the special rifle "Bad News". It's stats are listed below.