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Pressure Maybe?
Customer had a problem.Total lock up.Worst I have ever seen.Bolt,carrier and upper were not coming apart.Load was 12g of 296 w/ 240 gn bullet.He chrono'd
it at 1200.The only shot.Barrel was 10 1/2" SS one of mine.Extractor was bent.I did get it apart by cutting the barrel extension.
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