Originally Posted By PFran42:
I think this is feeding off of a different review where Sig did in fact provision the test weapon with a commercial buffer tube. In the review I read, quite a few commenters asked the author to change the review to reflect the fact that the M400 does in fact come with a Mil Spec receiver extension tube. The author would not change his review as his test sample came with a commercial tube and people (who don't know any better) have been regurgitating these incorrect specs ever since.
The Sig Sauer M400 has a Mil-Spec receiver extension tube (buffer tube).
Right on. Thanks man. Now I REALLY want one