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The eagle arms rifle i got from wolverine came with a mil-spec receiver extension . The armalite rifle i got from wolverine did not have a mil-spec receiver extension .
I was trying to figure this out a while back, and found this on Mag Pul's website, specifically as it relates to installing a CTR stock. A milspec buffer tube will take either a milspec stock or a commercial stock (with some wiggle). The commercial tube will only take the commercial stock.