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I believe a slightly heavier buffer can also help with fail to extract, as it can delay the BCG moving backwards, giving the brass case a little longer to return to normal size after firing..
At least that was the theory I was told when I had the issue.
'Unless a law-abiding individual has a firearm for his or her own defense, the police typically arrive after it is too late. With rigor mortis setting in, they mark and bag the evidence, interview bystanders, and draw a chalk outline on the ground' - Judge Benitez , 2019, Duncan v. Becerra.
'One of the ordinary modes by which Tyrants accomplish their purpose without resistance is by disarming the people and making it an offense to keep arms.' Supreme Court Justice Joseph Story, 1840.
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