This is totally anecdotal, but it might be something to pay attention to next time you bring your pf9 to the range: I have a friend that has accompanied me to the range before bringing along with him his pf9. I had never shot one before so per usual etiquette he offered me to shoot it. I shot one mag through it and after the last round it locked back. He was suprised because as long as he had the gun it never locked back after the last round. He shot it next and sure enough the slide didnt lock back. I offered him my glock 19 and after the last round it didnt lock back. Now that got me going. I asked him to shoot it again and I watched closely as he shot it. Ah ha! His support hand thumb was ever so slightly resting on the slide lock lever causing the slide not to latch. He altered his grip and tried his pf9 and sure enough the slide locked.
Not to say this is what is wrong with your gun. Joshua
Great news. I knew you'd get zeroed in on it. I have big hands and it took me some time to get used to that skinny grip. Fun to shoot though, huh?
This for me to.I have one and it eats all the cheap target ammo I put in it. No fails so far. Slide locks back OK. I have only put about 350 rounds through it though.