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Posted: 4/14/2008 10:22:09 PM EDT
[Last Edit: 4/14/2008 10:22:33 PM EDT by kstarr]
I understand they are different sizes, I've seen the measurments somewhere on here before.  But why would someone prefer one over the other?
Link Posted: 4/14/2008 11:21:08 PM EDT
Mil-spec...... more stock body choices like VLTOR, LMT  etc.
Link Posted: 4/14/2008 11:28:47 PM EDT
How can I tell which one I have? I bought my stock and tube with spring and buffer used on gunbroker.
Link Posted: 4/15/2008 1:24:23 AM EDT
I only use MAGPUL CTR stocks on carbines so to me it doesn't matter.  I have ARs with commercial and ARs with MILSPEC.  

As long as the stock your prefer fits, it makes no difference unless your are one of the many who get hung up on the word MILSPEC.

But, as already said, MILSPEC receiver extension do allow more stock choices due to some manufacturers not making commercial size stocks.
Link Posted: 4/15/2008 1:24:55 AM EDT
Commercial will have the threads cut into the tube, so the threads will be even with the surface of the tube.  Mil-spec will have the threads raised slightly above the level of the rest of the buffer tube surface.
Link Posted: 4/15/2008 7:11:51 AM EDT

Originally Posted By isptroop38:
Commercial will have the threads cut into the tube, so the threads will be even with the surface of the tube.  Mil-spec will have the threads raised slightly above the level of the rest of the buffer tube surface.


Better way.

Look at the area where the bottom rail goes into the body of the tube.  If the edge is a sharp "cut", it's milspec.  If the joining point is rounded, it's commercial.
Link Posted: 4/15/2008 4:19:48 PM EDT
or, you could just measure the diameter of the tube.  If it's 1.14" it's mil-spec and if it's 1.17" it's commercial - at least according to the instructions that came with my CTR stocks.

I don't change stocks out much, if at all, so it's a non-issue for me.  The last few DPMS commercial buffer tubes I've bought were $12 each, so again, a non-issue for me.
Link Posted: 4/15/2008 6:43:26 PM EDT

Originally Posted By shamayim:

Originally Posted By isptroop38:
Commercial will have the threads cut into the tube, so the threads will be even with the surface of the tube.  Mil-spec will have the threads raised slightly above the level of the rest of the buffer tube surface.


Better way.

Look at the area where the bottom rail goes into the body of the tube.  If the edge is a sharp "cut", it's milspec.  If the joining point is rounded, it's commercial.

I disagree that it's better.  The critical difference is the diameter of the tube and the size of the tube relative to the threads is an easy indicator,  Differences in the shape of the bottom rail may be generally accurate for current stocks but may be wrong for older versions and/or may be inaccurate for newly introduced items.
Link Posted: 4/19/2008 7:22:42 PM EDT
So you can fit either mil-spec or comm. on any lower?
Link Posted: 4/20/2008 11:50:57 AM EDT

Originally Posted By kstarr:
So you can fit either mil-spec or comm. on any lower?

Yes.
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