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Legal implies a law. Laws are based on where you are. We get questions from many different nations here. In the US, there is no limit on the size or caliber- except that firearms larger than .50 caliber without a recognized sporting use (such as a shotgun, elephant gun, etc) must be registered as a Destructive Device, and a $200 Federal tax paid on the transfer of it to you. But if you want to own your very own cannon you can (and some folks do)
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