The PF 9 has run into a host of initial problems, most of which we hope can be worked out. One of the regular guys on the Kel Tec forum has been testing the gun for several months now with different extractors and modified parts. Kel Tec has been providing him with spare parts for his testing. We hope to hear something following the ShotShow when Kel Tec reopens as to what modifications or changes are planned for the design. The gun itself is not much smaller that the P11, except that it is thinner. Where the P11 can hold up to 12+1 rounds, the PF9, being single stack, only holds 6+1. The main advantage I see is that it is a little bit lighter than the P11 and thinner. Personally, I prefer the capacity advantage of the P11, and it is still light enough for comfortable carry.