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Of all the parts of an AR15, the one part that is not standardized is the buttstock buffer tube. At first you would think the difference is just the diameter of the tube itself but that's just the first thing give folks trouble when matching up the different tubes and butt stocks. The commercial tube is 1.17" diameter and the mil. spec. is 1.14" diameter. So even though a "commercial" buttstock will fit on a mil.spec tube, it will be loose and I guess you could even force fit a mil. spec. ... Read more