I just got the pps 50 with the wooden stock a few weeks ago. The gun feels good, but my first trip to the club with it wasn't good. First had light strikes and it would not fire. then started to work It would not feed or eject I was using the 30 round stick mag. I was shooting it quick. 200 hundred rounds and it was working not to bad. The second time out. I just got a new drum mag. The steel one. It's not all that bad to load with the tool, I found this on google http://legacysports.com/pdf/PUM_PPS50_Load%20Assist%20Inst.pdf
It had one FTE with 50 round drum mag and a few with the stick mag. I stripped it down and gave it a good cleaning I will be taking it to the club to try it again and will let you know. It just needs some break in time. Well I hope. I was uing Federal Bulk high velociy ammo maybe I might try something else. I like the gun and all good reviews on it. It sure looks cool with that drum mag.