At the risk of reviving a dead thread
I was shooting my rifle this weekend and had about 7 or 8 FT Ejects. Upon examination of my bolt, the ejector seemed fine with good spring tension, the extractor rim is in good shape, but dirty (shame on me), and my bolt gas rings were worn, not to the point that they wouldn't support the carrier weight if stood on the bolt face, but 2 of the 3 were obviously missing pieces/excessive gap. The carrier gas key is tightly staked down and gas tube is in good shape.
My question is could worn rings cause this FTE? I have since cleaned the rifle well and replaced the gas rings with the one piece coil type, I have also installed a new extractor spring, crane, and o ring upgrade kit just to be on the safe side. Any answers or advice appreciated.