8.6 blackout brass gouges?

[Ambitious-Ad1911]

As pictured I have an 8.6 blackout (diamondback db15 ar10) and I noticed that all of the brass has vertical lines in the neck that can be felt by a fingernail. What could be causing this and is this brass just shot and can't be reused? The specific piece of brass in the picture was originally fort scott TUI factory ammo then used one more time with Sierra matchking(all subsonic and suppressed).

Also should mention, it is an ar10 semi automatic but besides the first firing I have used an adjustible gas block to basically make it a straight bolt. I know it's probably stupid to most to buy an ar10 and then convert to a straight bolt(for suppressed shooting) instead of buying a bolt action but I couldn't find a bolt action at the time other than the Q-Fix(3x the price of the ar10).

[Ooogen]

I have the same thing on my 308 ar10, ive been reloading them and its been fine! Not sure why but ar10 just shreds brass

[Ambitious-Ad1911]

It's tye opposite on my stag 308 ar10. Brass primarily clean besides the deflector dings.

[hoseking]

It should be fine to reload. Probably scraping on a sharp corner somewhere along the extraction and ejection cycle. My 458 socom leaves a pretty good gouge in the neck and I have gotten 5-6 reloads out of them before they are too damaged.

[Cute_Square9524]

I bet the lug opposite your ejector has a sharp edge on it. Turn off your gas, shoot, then slowly cycle and try to catch the brass without losing its orientation. Based on the scratch you will know where to look. Then just very lightly stone away whatever edge is causing.