Buzz McCallister's BB gun was a pump-action BB shotgun that first appeared in Home Alone.
When the McCallisters left Kevin home alone, he took Buzz's gun and practiced shooting it on some sports figures. When Harry and Marv intended to break into his house, Kevin put the booby gun through the doggy door and used it as the first booby trap, shooting Harry in the groin and Marv in the forehead, causing both men a great deal of pain and distress—this led to their newfound motive to harm him.
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