Help with CA-3

Its me again. CA-3 has been failing to eject, resulting in double feeds and very hairy malfuctions. I replaced the extractor, extractor spring, and the ejector spring. I gauged the bolt gap and it came back .3mm. From what I understand that is well within speck. Any other ideas to fix this rifle before I warranty it? I'd rather pay 50$ in parts than go through the hassle and transfer fees of warranting it. Any help is appreciated.