Took my P11 to the range with 2 mags of ammo, first mag the slide held back fine.  Loaded 5 rounds and the slide didn't stop, checked the gun over loaded 5 more, same symptom.  On closer inspection I found the slide stop had snapped off inside.  Emailed Kel Tec and had a replacement slide stop in my mailbox within the week   No charge, No questions, No arguments, just good solid service.  The P11 is now back  100%