If you turn your reg up too high, you will hear leaking from inside the gun. That's normal. It's basically an indication that the pressure is too high. I keep my regs around 250 (HP) and 85 (LP). That seems to work well for me, keeping velocity under 280fps.
Not sure about your bolt pin popping out. That's a new one for me. If you don't already have the new manual, I highly recommend downloading it and reading it over. Great info:
Good luck with it.