Sniper

Not all rogues specialize in sneaking or assassination. Some work at hiding and taking a shot in the dark.

Long Shot

You no longer make long ranged, ranged attacks at disadvantage. Additionally you can make a Wisdom (Perception) check DC 15 at short range, 20 at normal range, and 25 at long range to add your Intelligence (Investigation) modifier to the attack and damage role of your next ranged attack. You can do this a number of times per long rest equal to your rogue level.

Siper's Proficiency

You gain proficiency in firearms, light and heavy crossbows, and tinker's tools. You also gain tinker's tools for free when you take this archetype as a result of your experimentation with firearms. You can also use your action to repair a firearm.

Sniper Blind

You can spend 10 minutes to build a makeshift hideout. Wile in this blind you have total concealment, and, if you are hidden when you make a ranged attack, you can make a contested stealth check against the target's perception check to remain hidden.

Quick Load

You can reload a firearm as a bonus action and, a crossbow as a free action.

One Shot One Kill

On a hit with the first ranged attack you make in combat you automatically score a critical hit and, if you are hidden from your target, all sneak attack damage dealt by this attack is maximised.