I wanted to ask about any problems with the GSG5P. I have a first generation and have had various issues. I finally took it to my gunsmith because of feeding problems, ejection problems, soft hit misfires. What he found was a cracked bolt (pot metal), the chamber was so tight that he couldent get a reamer in, the barrel block was loose and would rotate. The gus is going in for repair, how is their service?