I also have a 9mm Px4 Beretta (full size), and took advantage of Beretta's free poly holster offer, which is a very good carry (snaps into and out of it pretty easily). For this particular holster, it seems to work best as either middle of the back, or 4 o'clock position, but then that tends to be whatever you personally find to be most comfortable. That said, my usual carry weapon is a Taurus .357 Magnum w/ 2" barrel. I agree the Px4 is a great firearm, feels great and is one I'm proud to have in my collection. I'm just needing the additional firepower as a camper/hiker/backpacker, and bears have no sense of humor. I'm also trying to figure the best holster for a newer buy, as I just got a Ruger GP100 (also in .357 Magnum, 4" barrel). Will probably go with a fanny pack holster for the woods on this one..