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Guardian. the doctor says even exposing young teens to the environment dangerous. >> its another family gaming activity right? wrong. i dont think its just another activity. i think this is something that can seriously affect child development and not in a good way. >> reporter: he points to the incident last year at an arizona shooting range -- >> turn it forward -- >> reporter: where a 9-year-old girl firing an usze accidentally shot and killed an instructor. here at machine gun america, child...