First of all I am looking for a concealed holster for my m&p 40, I want one that goes on the hip inside of the waste of your pants. Does anyone have any suggestions? Also, mine fires without the mag. Is there any way I can change this? Can I get the safety to where it wont fire with the mag removed? And the last one, I read on here the other day about being able to convert the m&p 40 to a .357 by installing another barrel...is this possible?