The case on the far right looks as if it has been handloaded with too much lubricant on the neck and shoulder. Are these handloads or factory? If they are handloads, what is the powder, charge, and bullet weight?
Do you have a standard gas block and/or a standard bolt carrier? If you do, you may want to consider putting both in the rifle and see if you still have the problem. If the problem goes away, then replace one and retest.
Also, I did not see what buffer and spring you are using.
Do you have a standard gas block and/or a standard bolt carrier? If you do, you may want to consider putting both in the rifle and see if you still have the problem. If the problem goes away, then replace one and retest.
Also, I did not see what buffer and spring you are using.
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