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12/4/2008 3:08:45 PM EDT
How much better is a mil spec stock compared to a commercial stock?  What is the main difference?
12/4/2008 3:17:30 PM EDT
[#1]
The buffer tube will determine whether you need a mil-spec or commercial stock.  

Commercial tubes have a larger outside diameter.  The threads are cut into the tube rather than rolled on as they are on a mil-spec tube.  Both have the same inside diameter and will use the same buffers and springs.

I use mil-spec tubes for no other reason than there are more stock choices.
12/4/2008 3:18:09 PM EDT
[#2]
Size difference is not that big, I've never heard of a commercial tube failing where a mil spec would have survived.
Besides availability of stocks, I don't see much difference.
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