OK, so this Bushmaster Varminter has a Fulton Armory stainless bull barrel. It's fitted with the FA .936" gas block with a rifle length tube. The gas block is well aligned and sits just outside the hand guard. The rifle runs just fine. The issue is the ejector pin seems to be smearing the brass on the case head upon ejection. There are curved scratches on the case heads where the ejector pin would contact the head. Looks like it's caused by the ejector pin as the bolt rotates open to eject the spent casing. The scratches don't happen if the action is cycled without firing. My best guess is that the BCG is getting too much gas pressure too soon and the case is being extracted before the pressure in the case has fully subsided. Thus, the case can't rotate in the chamber along with the bolt, and the ejector pin is being dragged around the circumference of the case head, causing these scratches. Naturally, I'd like to do something to remedy this just because it shouldn't be happening, but I have a feeling that it is also unsafe, and may also be affecting accuracy. The headspace has been checked, and it's on the tight end of normal, but it's within specs. I've ordered a Wilson Combat adjustable gas block that will allow me to tune how much pressure the BCG sees, and how soon it sees it. That's my best thinking on the issue. Anybody got any other ideas or comments?