Quick CMMG lower question

[SmokinGun]

Hey guys. I am visiting family and I am away from my rifle right now or else I could answer my own question. I just bought a complete CMMG lower and was going to buy a magpul stock for it but when we went to buy one there are 2 diffrent buffer tubes sizes (mil-spec and commercal). I called the place I bought the lower from and they had no clue what one it was so thought I was ask the people that know the most about guns. Anyone know what size fits the buffer on the cmmg lower? My old man is offering to get me one for a late christmas present and I can't pass it up.

Thank you and hope everyone had a good holiday

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[drew]

Pretty sure CMMG uses mil-spec tubes.

Here is the Magpul comparison document. The link I found to Magpul's site was old and didn't work.
http://www.skdtac.com/v/vspfiles/downloadables/Receiver_Extension_Comparison.pdf

 

[iamme]

Commercial tube same diameter whole way, milspec the threads sit higher then the tube by a little.