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Pat O'Brien is a guitarist for the death metal band Cannibal Corpse. He currently resides in Florida. He is a lifetime member of the National Rifle Association. He owns a collection of guns including a Spas 12, an AK-74, and various tactical assault rifles. He has writing credits on some of Cannibal Corpse's more complicated songs, including "Hatchet to the Head," "Systematic Elimination," "Frantic Disembowelment" and "Blunt Force Castration." He is featured on the albums Gallery of Suicide, Bloodthirst, Gore Obsessed, Worm Infested, The Wretched Spawn, Kill, and Evisceration Plague.