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Old January 22, 2013, 06:58 PM   #9
Senior Member
Join Date: August 1, 2010
Location: Tampa Bay
Posts: 4,371
Did you pull the bolt, point the muzzle at a light and do a visual inspection?

What did you see??

I ran into the same thing with my son's AR-15 chambered in 6.5 Grendel. It wasn't shooting "right" last time at the range so I checked it out for him.

I was cleaning it for him and felt a restriction just ahead of the chamber when running a patch through the bore.

Pulled the bolt and there was this ugly looking black ring there- I thought something had torn up the rifling it was so thick.

Turns out it was a very hard to remove carbon ring- took a lot of scrubbing/brushing with JB Bore Paste, and Carb-out, to get rid of most of it. I still see black discoloration, I think it's just the stainless steel discolored because the rifle is back to shooting sub-minute.

The location- just ahead of the chamber- suggests that to me... it'll be easy enough to see if that's the case.
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