I have a H&K USP .40 which I am thinking about upgrading in increments to have features similar to the USP Tactical. Many of my questions have already been answered, sights, amb dex safety, etc. However, I was looking into whether or not I could, without disaster, swap the stock barrel with a threaded 4.9" USP Tactical barrel. It looks pretty straightforward, but the last thing I need is an exploding weapon prompting me to devise a clever new way to play guitar and write left handed. Any help would be greatly appreciated.