Gunner

You're the archetypal gunmen, with a flare for panache. Quick to shoot with a deadly aim, rogues who follow the Gunner archetype are usually discreet and might even choose to draw a crowd to witness a duel. Gunners are renowned for their keenly honed senses and reaction time, making them an especially deadly foe. 

Quick Shot

At 3rd level when you choose the Gunner archetype, you develop the skill to start rapid firing your weapon. If you're wielding a weapon with the Ammunition property and used your Action to make an Attack with it you can use your Bonus Action to take an additional attack with the weapon. You can use this ability a number of times equal to your Proficiency Bonus. You regain all uses at the end of a Long Rest.

Quick Reaction

As a gunner, you've honed your senses so that you can act quickly in any situation. If you are Surprised by one or more creatures, you may still take a Reaction on your first turn. You also have Advantage on attack rolls against the creatures who surprised you on the first attack you make in that combat.

Armor Piercer

The keen eyes of a gunner are ones that are feared for their abilities to find and exploit weaknesses in even the most well made armors. Whenever you make an attack roll against a creature, if the result is equal to the creature's Armor Class, the attack is a Critical Hit.

Aimed Shot

Gunners have the unique experience of being used to aiming on the move as tend to be in their worst interest to stand still in a fight. Whenever you use the "Take Aim" Bonus Action, if the attack hit, you can immediately move up to half your speed.

Rapid Critical

Already being quick on the trigger, a particularly well fired shot is often all a gunner needs to turn an entire situation in their favor. Whenever an attack roll you make is a critical hit, you can immediately make another attack roll against the same creature at no cost.