My limited experience with shot-out barrels is that it happens all of a sudden, I mean, they don't start keyholing a little and the gradually get worse-- they go from OK to keyholing over a short number of rounds.
I think 12K is "got your money's worth" in this caliber (or 5.56 for that matter).


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If you have the time, mind PMing me the best way to remove that SureFire brake? 
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