Your caution is a good thing, but I don't know where you got that idea from. It's not part of the warranty verbage in the P-11 User Manual.Thanks again. I cleaned and lubed the slide, barrell, guide rod etc. But didn't go and removed pins and take it apart etc as I believe warranty info says not to.
Yes, they did have some bad batches of trigger bars. The grooves weren't machined quite deep enough.There seemed to be quite a few issues like this in the November 09 time frame. IIRC, it was only for a short period of time, but it seemed like every other day there was a thread about it! There were a lot of responses about applying grease to the trigger bar channel, dog legging the trigger bar spring and deepening the channel. It was for a short period of time though. Keltec may have had a bad batch of trigger bars or springs. It isnt posted as much anymore. I own 3 P11's and have never experienced it!
Some times the bar does not have a deep enough groove to retain the spring.The spring popping out can sometimes be cause by not putting grease on the trigger bar, it happened to me when the gun was new , added grease never has happened again. Based on what the op said, I wonder if he fully cleaned and oiled the gun before his 350 rounds went down range.
For me I used whinchester white box fmj, then bought some Hornady Critcal Defense. That day I shooting both, rapid fire when it happened. I figure no matter how many times you practice ur gonna dump 5 or 6 quick when SHTF. It would be nice if gun could.