This image should be stickied!Tons of info on this out there, lots of variation.
I've got 2 6-POS buffer tubes that are Mil-Spec in every dimension except they have the slanted ends. Sucks, cause I needed to buy those friggin extended pads to get my stock to lock in POS-0.
Here's something to get you started:
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This image should be stickied!
Also the mil-spec has more pointy peaks on the threads as op-posed to the comercail 1's that have more flat and rounded threads.



























