Bullet Marring in Grendel AR

[Red*Lion]

Ok I see the problem.

You need to polish and blend your feed ramps. Your right side feed ramp is out of line with the extention feed ramp and causing your issue.

Like I stated before, perrty typical and not really adding to the lack of accuracy. But the feed ramp is what is causing the issue at hand.

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.