Did notice that it looses up a little not so stiff after a 100 rounds. the only prob was forarm came loose on one shot not sure what that was about but will keep an eye on it.
Just wait until you have 1,000+ rounds through it
I flip the lever on mine and it just falls open under its own weight. Locks up tight though. My wife has taken a liking to it and prefers to shoot it over my Franchi. I was thinking about having the stock cut down so it fits her a bit better.
As far as the forearm coming off, a buddy of mine has the same issue. I think we finally narrowed it down to not using enough force when clicking the forearm back on. I put mine on with authority and so have never had an issue. If you can get the crappy cosmoline-like goo they put on everything off it may help as well.