Sorry if this is a rookie question, but my V51 has been having some issues with failure to eject and doublefeed. Usually what happens is the brass is lodged between the bolt and the forward lip of the ejection port, with the receiver edge cutting almost down the middle of the case mouth. I've heard a couple of opinions on this, including the bolt assembly not retracting far enough under recoil and the stock Vector ejector not being right somehow. There is a noticeable gap, about 2mm, between the top of the ejector channel in the bolt and the top of the ejector when the bolt assembly is fully retracted and the cocking handle is locked back. Is this normal in an HK? Any thoughts are greatly appreciated, as always.