View Full Version : Stock Purchase -- Which to buy: milspec or "commercial"

05-21-2009, 3:36 PM
I am looking at buying a stock for my first AR15 build, but I've run into a question that I'm unsure of.

Here's an example from Vltor's website regarding their EMOD:
"The EMOD is available for either the standard "MilSpec" receiver extension tube, or for the aftermarket "Commercial" size tube."

They sell either the stock by itself, or as a combo kit with a milspec receiver extension tube. How does a "commercial" sized tube differ from milspec?

05-21-2009, 3:48 PM
Check out this document for the specs on MilSpec and Commercial tubes. Commercial is a bit thicker but I don't think it really makes a difference.


05-21-2009, 3:51 PM
From my research I'm convinced milspec is stronger even thou It's smaller. It has to do with the way the threads are made to screw into the lower.

05-21-2009, 3:51 PM
Go with milspec. They you have alot of readily available options...Magpul CTR, LMT SOPMOD, VLTOR, and standard Colt M4...just to name a few.

05-21-2009, 3:54 PM
Milspec it is. Thanks for the advice.