It's for the 12-gauge. By the way, Hogue says
- A flat washer MUST be used with the factory stock bolt. A washer is included with the stock. The Hogue stock is designed to reuse the factory stock bolt with the addition of the flat washer.
- The stock bolt (not included) is a 5 ½”long 5/16” – 18 TPI with a flat washer, available at any quality hardware store, gun parts retailer, or from Mossberg directly.
Mark H.