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Here is the definition of a large-bore destructive device according to Wikipedia:What about a 12-ga. shotgun? I believe the bore is .78".
Wikipedia said:Any non-sporting firearm with a bore over 0.50", such as a 40mm grenade launcher often used in conjunction with military rifles. (Many firearms with bores over 0.50", such as 12-gauge shotguns, are exempted from the law because they have been determined to have a legitimate sporting use.)