In The Evil Within 2 the Full-barreled Shotgun location is found in the storage shed just a few meters south of the “Post Plus” safehouse. That’s the safe house in the very north of chapters 7 & 13. After leaving the safe house walk in a straight line for 10 meters and you’ll run into the storage shed.
The problem is that the door is locked so you must get the key first.
Key Location:
The key is found on the corpse of a soldier in the south of the map. Get the key and return to the shed.
Storage Shed Location:
Open the door with the key. Inside the shed you’ll find this special shotgun. You can equip it by opening the weapon wheel and pressing Square (PS4) / X (XB1) on the normal shotgun. It has better range than the other shotguns which makes it good for medium distances.
You can do this in chapter 7. It’s still possible in chapter 13 when you return to the same area as before.
I’m on chapter 6 and can get in the shed but not out. This walkthrough stinks.
I got it just fine, and FYI it did say this is possible in CHAPTER 7… at least read it before you bash it
You get out automatically just wait a while. Some ghost lady spawns and goes away after a while, you can’t miss it.