What would you call this thing other than an light machine-shot-gun? (Make sure you swap the barrels out to keep anyone without a sense of humor happy).
Like any “because you can” weapon, the beltfed 12 gauge is a special kind of crazy, the kind you want in your collection. While there are a few malfunctions, the “jam” appears to be spent casings failing to clear the bolt.
Fix the jamming issue and you have the greatest home defense weapon ever.