OK - I know I posted a "642 or 442" thread earlier, but I want to be more specific and ask why a stainless steel barrel would be that much better than the one on the 442. As mentioned, I will be carrying 99% of the time in a bullet proof vest holster. I live in Connecticut so it can get hot for a few months in the summer. I really like the look of the 442 over the 642, but the gun will be hidden most of the time. If I go to the detective bureau then I will likely carry in a pocket or ankle. So what do the materials that the 642 is made up of over an advantage over the 442? How much durable is the 642 going to be over the 442? Thanks again