I got mine from Sportsman's Guide. Ordered the Glock mag adapter from Chiappa directly. It's heavy, ugly, and pretty damn accurate. It's also a lot of fun, especially with a binary trigger
Nope, no issues whatsoever. It runs like a top and seems to eat anything I feed it. The stock trigger is pretty good too.
Edit: forgot to mention that I was talking with a guy who had some PAK-9 videos on YouTube before buying mine. He suggested putting some oil/CLP into the firing pin channel and using grease on the rails. I did this before putting a single round through the gun and haven't had any issues. Apparently he was having light primer strikes with his.
Was looking for this video earlier, turns out I had already uploaded it.
We were messing around with water jugs at 100 yards. The phone camera got weird with focus and exposure but you can see it's ejection pattern (healthy!) and what sort of fun it is.