I just recently picked up a P320 X5 and out was pretty stiff out of the box, and I was getting hangups just out of battery. Could really feel a grind as the cycling started and the barrel unlocked from the slide. Gave her a clean and a lube, and then let it sit overnight with the action locked back. From just that one night, it would no longer hang up 1/4" out of battery like before, and I couldn't get it to not go fully in. So I figured that just that overnight span with the slide locked back either helped break in the recoil spring, or...with some of the findings in this thread.....
......maybe it helped break in the disconnector lifter spring, which was hanging the slide up from friction. Let it sit another night and it was even better, just as smooth cycling as my P320 Compact (also with safety upgrade/disconnector).
Took the X5 to the range today, 300 rds of Remington UMC and Blazer Brass, not a single issue or hangup. All good ejection, no out-of-battery, slide lock every time. Feels just like my P320 compact but less muzzle flip. Felt fine, and glad there were no issues.Only thing is that it prints WAY low. Even with the rear sight cranked up as high as it seems to go, I was getting 2" low at 35-45 feet! Front sight measures around .245" high. I ordered a Dawson .215" hight front sight, should hopefully fix it for me. But anyway, seems the out-of-battery somehow worked itself out before even shooting it. So I guess I'd recommend letting it sit a few nights (after proper cleaning/lubing) with slide locked back if others are getting those issues.