I have been having a problem with it stopping just short of going into full battery once every 200 or 300 or so rounds and requires a very light nudge to send it home. When I first got it it did this a bit more often (every 25 to 50 rounds) and I replaced the recoil spring with a Wolf 22lb (which was about 1/2in longer) and it seemed to reduce the problem to what I have now. Originally I thought it just needed a break in period but after about 1000 to 1500 rounds I think it has had plenty of time for that. Any idea's?