Match fit barrel - SIG SAUER 320 45 Full Barrel

Nice barrel, I’m using it to convert my p320 xten 10mm to a 45 auto. Barrel came in new unopened condition, but be aware that some fitment will/may need to be done to fit the barrel into the slide. I don’t know if the tolerances don’t match or what, but it does not simply drop in, despite the fact that this barrel is made for a p320 xten/45 auto pistol, which have a slightly larger frame and FCU than a standard 9mm, 40 cal, etc p320. However, most aftermarket barrels require this, so I was not totally surprised.