M37 Shotgun

Main House 1F, Display Room (south of the Main Hall), in the statue's arms. Taking it locks the room until you put back something of the same weight: the Broken Shotgun (Main House 2F, Grandma's Room, propped against the boxes by the door; needs the Scorpion Key) or, later, the Model Shotgun. It comes empty.

Madhouse: the Model Shotgun is in the Processing Area Dissection Room, and the Scorpion Key costs 3 Antique Coins in a Main Hall birdcage.

Your answer to close Molded and to Jack in ch02-ch05; swap it for the M21 once you have it.

• Does +70% against Molded: a full blast to the head kills.
• Shells cannot be crafted: ration them from ch02 to ch05.
• If you have the room, carry both shotguns.

Per-pellet damage: sources disagree (80 x 9 measured in play, 90 per hit in the game files). The total of 720 per shell matches in both.

Nightmare: 100 Scrap. Ethan Must Die: purple crates (3 stars).