Very very UNHAPPY with mine!! I cant get it to cycle anything reliably (Walmart cheapy, Win AA, or Federal target loads). Sometimes wont fully eject, other times bolt locks back when not empty, other times bolt releases but doesnt fully go fwd. Between 200-300 rds so far and put in a stronger mag spring, new o-ring, aluminum follower, and oil the crap out of it... all to no avail. Anyone with any suggestions please chime in...