Marksman

Many rogues are inclined to get up close and personal to deliver their decisive blows. You've come to find picking off enemies from a safe secluded vantage point to be far more efficient. Enemies can more easily detect your presence if your always trying to sneak up on them. When you attack from a far off location, they'll never see it coming

Unseen Shot

Starting at 3rd level, your swift and subtle movements while shooting a ranged weapon make it easier to surprise your foes, allowing you to shoot from the most discreet vantage points.  You can now make ranged attacks as if you were standing in any space within 5ft of your current position, even from behind what would be total cover.

Bonus Proficiencies

When you choose this archetype at 3rd level, you gain proficiency with longbows, light crossbows, heavy crossbows, and firearms.

Deadly Aim

At 9th levl, your knack for finding the smallest breaks in an enemies defense is uncanny. Any ranged attack you make critically strikes on a roll of 19 and 20.

Dive for Cover

Starting at 13th level, your position becoming compromised is no issue for you, as you can easily find a new vantage point. Whenever you disengage and move no more than half your available movement, and make it to cover, you can make a stealth check as a  free action.

Focused Shots

At 17th level, by focusing all your attention on the shot, you are able to greatly increase its potency. If you do not move more than 5ft and take no bonus action this turn, you can reroll any 1 or 2 you roll on a damage die from a ranged attack.