Dude, he was a prison inmate, if it's one thing inmates know how to do it's smuggle contraband. He probably had it up his butt, most likley place anyway.
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Damn, have you seen the size of that gun?Ouch...
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Worse than that, it was in his rectum and now he's shooting it at you. You're getting waste particles and all other kinds of nasty stuff fired at you.