Most of the honeing, chamfering and rounding you could do yourself. Possibly the same on the extractor but you have a better one so forget I even mentioned it
I am not over fussed on the little pin holding the firing pin down. Doesn't the charging handle hold it down in pretty much the right place?
I also have my doubts on redoing the firing pin profile. is it really that inconsistent?
I do get where they are coming from over having the bolt faces square but wonder how much actual measureable improvement you would get. I would thing the chamber would be more important.
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