Bullet Marring in Grendel AR

[DL42]

You have a better eye than I do. With that said, it really never hurts to polish and blend feed ramps. I had to do a pretty aggressive job on my 11" 7.62x39 pistol, but it ended up helping a lot.

I believe this is exactly what is causing my issue, I just find it odd that it the issue hasn't existed the whole time this upper has been together. When I torqued the barrel nut, I torqued it around 60 lbs/ft, and I also used Indian head to create a tight seal, so I would be shocked if the barrel has actually rotated some over the course of shooting it. At this point, I am going to send it out to a gunsmith to have the feed ramps polished and matched to the barrel extension.