semi-automatic weapon with multiple magazines, ammunition magazines? how hard is it for a person? is it simply a retail operation, you go in with the cash, you buy it. a lot of states do i have open carry laws. let me make clear my comments about the preoccupation with guns pap that s not my view necessarily. that is the view of many in many law enforcement who say in the wrong hands, in the hands of somebody who is unstable, it can become as we have seen time and time again a sick preoccupation. i m from colorado. i ve been around people who were hunting all my whole life. my own family hunting. but what s happened now in terms of these individuals who seem to turn to these mass killing machines and mowing down people in schools in, calf tier yaz, in churches, at rock concerts or country music concerts really has taken on a life of itself. thank you so much. tom costello for nbc news.