Armed, maybe dangerous Sue King, left, a certified gun instructor for the National Rifle Asssociation, instructs Gloria Whipple in the proper use of a pistol at the American Shooting Center in Houston. According to gun dealers, Houston residents have begun to arm themselves in response to court-ordered mass releases from the crowded Harris County Jail. Under the federal order to reduce jail overcrowding, 254 inmates have been set free by Harris County authorities in the past week.