I'm new to this forum. I took my 6.8 out for the first time yesterday and noticed some marks on all of the spent casings. They are vertical lines about 5/32 apart on the neck. Can anyone tell me if there is something amiss? Is this normal?
Here is URL for my photo;
Thanks guys for all your help. I kinda suspected the barrel extension but now I am comforted by all your experienced advice and knowledge.
What Constructor said looks right from the pictures. I figured the same, and the advice he gave will adress the problem. The lug corners will wear down on their own given time, but if you're like me, impatience will win.