Is this a 1st gen? My very first Keltec, a 1G in hard chrome had a similar issue. Sometimes it wouldnt fire. I sent it back to Keltec and IIRC, the trigger bar was replaced.
It very likely is a worn trigger bar, or perhaps some slippage in the trigger pin/trigger axis. We have seen the trigger pin wear/start to come out, allowing the trigger to rotate slightly on the axis, thus hitting the grip before or nearly at the grip before releasing the hammer. Be aware that unless you are the original owne, Kel Tecs warranty does not apply. Also, there are few parts now available for these Gen 1 pistols (which is why I really baby my 1st Gen P3AT these days). Hope Kel Tec can help with some parts or advice here.Yes it's a gen 1. May give the boys at Kel-Tec a call on Mon.
Unless you have a padded vice, you may need more than 2 hands. With the pistol upside down and supported on a firm surface, use a small punch or other suitable tool and a small hammer or hard mallet and tap the pin back in. You may have to wiggle the trigger a little while doing this. With the pin firmly seated, drop a few drops of acetone (common nail polish remover/non-oily and with acetone) in the pin hole. Allow it to dry for several minutes and the put 4-5 drops of super glue in around the pin. Let it dry overnight. That should do it. If it works loose again, you can replace the trigger easily, or repeat the process and then drop super glue gel in and around the pin to fill in the gap. At this point you can also do the trigger with heat shrink, which will lock it in. You can also consider a Northwood trigger.Good call on the trigger pin WPhilB47. Mine is over 1/4" showing. I'm no gun smith, so I hope it's a easy fix. Thanks.
I covered that along with mabe going to the Northwood if he needed to replace the trigger. The 1st Gens usually will go back in. If he does have to get into the trigger he might decline, but if he wants to go for it we should send him to Pop's installation instructions, whether he goes factory or Northwood.It can be more involved if the method Phil described doesn't work.
I found out on my P3at. You have to remove the frame and break the trigger out. Then install a new trigger and pin. It can be done with some basic tools and a little time. I superglued mine in once it was working properly.