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Old January 1, 2011, 12:17 PM   #15
Senior Member
Join Date: June 28, 2006
Location: NEO
Posts: 202
If you are referring to the baffle tube threads, there is no difference between a MIL spec and a commercial, both will fit. The difference is in the OD of the tube itself. In other words, a commercial collapsible stock will not fit correctly on a MIL spec tube and visa versa.

I don’t believe there is an ‘advantage’ to the flange, purely cosmetic.

Again, be sure you have your tax stamp before attempting this conversion. I can not stress this enough.
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