You'll automatically pick this weapon up during The Coast portion of the game. Once you've gotten enough scrap, add the 4x Scope and Stability upgrades to allow you take down enemies from a distance. Like with the Bow, this weapon is extreamly useful for those trying to stealth their way through the game, as it allows you to kill enemies without making any sound.
Join Ellie and Dina, as they have to overcome difficult puzzles and encounters whilst traveling through Seattle. During this adventure you'll be able to find Artefacts for interesting backstory, Trading Cards for Ellie to collect, and Weapons to make the more difficult encounters easier.
The guide for The Last of Us: Part II will include all there is to see and do including a walkthrough featuring how to take down all encounters, locate all Collectibles/Weapons, and how to solve all puzzles.