I dont know this for sure, but I really do think that the throat erroision was the reason that the Rangers were back to the old Vietnam SOP of having a cleaning rod taped to the weapon in the early days of the GWOT.
Throat errosion is the first thing I check when Agents have extraction issues, and 8 times out of 10 its the throat, allowing the round to seat too deep, not a bad extractor/ejector.
But I end up replacing the entire upper and bolt.
Some of the folks who I support are on the bolt a week and upper a month plan
Life is too short to deal with Blonde women, or carbine barrels over 10.5 inches
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