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.308 ar - weird brass casing marks

five six

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Recently put together a Ma-Ten upper/lower with a fulton armory barrel and BCG (headspaced by them), and while adjusting my PRI gas block I noticed some weird brass markings. I am using some dynamit nobel 7.62 nato ammo.

The case has what appears to be 2 sets of perforations(like a perforations on your common pay stub) running vertically starting from the neck of the case. It only happens after shot, not when I load a round and eject it without firing.


If I can provide any more info please let me know.

Edited by five six
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Take a marker and blacken the case and mark top of case, but in mag with top of case up and cycle by hand, it will show you which feed ramp/s need to be deburred.

I used a small honing stone to deburr mine then followed by a cratex tip in the dremel to smooth it out better. watch the shank of the dremel so it dont hit the inside of the reciever.

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