You'll have this weapon automatically equipped when you begin playing as Abby. Like with the Bolt-Action Rifle you'll want to add the Stability and 4x Scope upgrades to the gun, as it will allow you to take down enemies from a distance.
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.