Is it possible to remove or disable the manual safety on the Shield? Can you convert a safety model to a non-safety model? My sister has been carrying a Shield 9 on her daily runs/hikes but noticed yesterday that the safety had been engaged the past couple of days and she hasn't really trained to disengage it upon the draw. I realize that is not an ideal situation but IMO the safety on the shield is so stiff and small as to be useless at best and possibly dangerous at worst. Can you replace the sear housing block with the block from the non-safety variant? Is there something else involved? I realize the best course of action would be to buy the non-safety variant but I'm just doing some research first.