(Bones) why did Booth have a massive gun in “the con man in the meth lab”?

Question by smile with me.: (Bones) why did Booth have a massive gun in “the con man in the meth lab”?
when he came to confront the cop he had a massive gun, i found it funny that he came with such a massive gun. like how did he know they cop would run? why wasnt a normal gun used?

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