Have any other AP4 owners experienced this? My gun fails to eject 100% of the time if I fire it with the ejection port cover closed. With the port cover open it runs fine. I polished the plunger on the cover, but it still will not eject.
Mine runs pretty well, with about 750 rounds thru it, but it will still not strip the top round from the magazine from bolt lock, if I load the mag to 20.