I've had my M&P 10 for a year and a half or so, I have no feed or injection issues, if functions very well. It has a Magpul PRS stock and once I got the buffer spring and buffer worked out it's
extremely smooth.
I am getting, on every round, these marks. It's hard to get a good photo of them but maybe these will show it. They seem to be superficial and once they go through the ultrasonic cleaner and press they are gone. Just wonder what causes them. My ejector spring seems really strong, rounds go 8 to 10 feet in a fairly
predictable pattern. Happens no matter what magazine I use, and all brass equally. I'm sure I'm not the only one seeing this, if it's been answered before please point me to the right post.
Thanks in advance for any ideas.
Bruce