I have played with my pgp before, which I bought used about a month ago. It is an old style with the ribbed deltrin pump and a dovetail back sight (if you know what I mean). I havnent really known the efficiency of it but when I tested it today to find out I found that it got about 40 good shots per 12 gram and squeaked 5 more out and after that the shots were lodged in the barrel. I bet the guy who had this gun gave it a valve job, what is the normal efficiency for a stock pgp?