I had problems with my Rami feeding in the past. I had to return to to the mfg. twice. It is now 100% reliable, or has been for well over 500 rounds. (Mostly Winchester fmj, but some Federal HST) If your Rami is not totally reliable, send it back. Usually once will do it, but if it still has problems, send it back again. The Rami is capable of excellent reliability. Its trigger pull (both single and double action) is pretty good right out of the box, and accuracy is good. It was not cheap. If I thought it needed parts replaced, I would not have bought it. If you want to do that, have at it. I am sure it can be made better, but for me, it is good as is.
