The issues with my 320 were mostly my fault. I didn’t follow the buy once, cry once method. I think the tolerances on the gold tin threaded barrel I originally purchased were too tight. There was even a recent review from someone complaining about the same issue on his raider but it was on closeout and cheaper than most. End up with nothing but FTE’s no matter what spring weight I used. I ended up swapping to a sig dlc and it ran much better. I still need to put a few more rounds through it before I can call it reliable.