greetings all. I just found this place this week after taking Pat's most excellent carbine class recently.
I would first like to say that the m4 comparison chart rocks. Thanks a ton for making that.
I'm having a barrel built, and the builder is including a stripped bolt that is headspaced to the barrel. The bolt has been MPI'd but being stripped, I'm going to have to find an extractor to go with it.
I recall Pat railing against some extractors in a previous class that were likened to butter, as I recall. But others have told me that all extractors are pretty much the same metal and hardened the same. [edit: In case that's not clear, I'm not questioning Pat's statement. I just don't know if the extractor in question was bad due to wear, or bad because it was built with crappy material]
I'm also familiar with the differences springs/inserts already, so I'd just like to know if there is a difference in the extractor itself, what do I look for and where would I go to buy quality?
Also, if there is a difference, consider adding a line for the extractor to your comparison chart.
warm regards,


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