Most here know I don't really care very much about meeting specs exactly... I care about the specs that matter, and ignore those that don't. This is one of those that, for the most part, doesn't matter.
I have worked on lots of ARs... The only time phosphating under the FSB has ever made the least bit of difference is when replacing the FSB with a gas block that has a different barrel footprint. Sometimes we'd have to Alumablack the barrel in the area that used to be covered, but no longer was.
For that reason, I prefer them to be phosphated under the FSB... but that's a cosmetic issue, not a functional one.


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