Base Class: Rogue
You've trained to fight from a far
Firearm Training
Starting at 3rd level, you have been trained with firearms giving you proficiency but also the knowledge to clean and repair them.
Long shot
When you choose this archetype at 3rd level, you the ability to crit on a 19 instead of a sixty if the target is at least thirty and you don't have disadvantage on the attack roll
Creative Genius
At 9th level, you gain proficiency in tinker's tools amd learn how to create attachments for your firearm each firearm may only have two attachments at a time
Scope-This attachment adds a plus one to hit on the equipped firearm, and can be upgraded to add a plus two or plus three
Silencer-When you shoot at an enemy their perception check to find you will have disadvantage
Stand-The gun has increased stability allowing you to make an extra attack as a bonus action
Barrel Stabilizer- This attachment allows you to use your reaction to take an attack on an enemy moving within your range and in your line of sight
Eagle Eyes, Fast Hands
Starting at 13th level, you ignore the loading property of firearms, and gain expertise in perception
Covered
Starting at 17th level, you spend ten minutes outside of combat to create a barrier that blends in with the terrain and grants three fourths cover