lol i think im that fella....its a piece o junk...stay away!!!
list of issues that mine has gone through:
1) all rails worked themselves loose in the first 150 rounds
2) after 200 rounds the buttstock fell off as a screw had worked its way loose
3) multiple FTE and light strikes (sometimes as many as 5 FTE on a single mag)
4) the "problem screw" that people have been speaking about worked its way out multiple times.
5) recoil stripped the threading of a critical nut (that connects the bolt to the frame)
6) for some reason the bolt began to close like halfway after the last round was fired from a magazine...inevitably causing a fail to fire on the next round
7) just today the button that adjust the cheekpiece fell out...and the spring disappeared somewhere at the range....
8) finish wear in many many different areas
I have done multiple fixes including replace hammer spring, replace firing pin, the gsg-5 firing pin mod, longer screws, locktite screws and sometimes these fixes would work for a while but nothing aleviated problems for more than a couple hundred rounds.
I really had high hopes for this gun....but in my honest opinion stay far far away!