Ken Haiterman shows off a CMMG 5.56mm AR 15 at the 2013 Rocky Mountain Gun Show on Jan. 6 in Sandy, Utah. In spite of the recent school shootings in Newtown, Conn., gun enthusiasts flocked to the show to purchase weapons and ammunition. (Associated Press)

Ken Haiterman shows off a CMMG 5.56mm AR 15 at the 2013 Rocky Mountain Gun Show on Jan. 6 in Sandy, Utah. In spite of the recent school shootings in Newtown, Conn., gun enthusiasts flocked to the show to purchase weapons and ammunition. (Associated Press)