AR15.Com Archives
 Buffer tube differences
tucansam  [Member]
1/17/2007 9:21:12 PM
I've seen some buttstock manufactures make reference to their models needing "milspec buffer tubes." I assume there is a milspec and a commercial spec?

Can anyone advise me the differences?
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45FMJoe  [Member]
1/17/2007 10:03:52 PM
Mil-spec is just that. Commercial are the same length, but for whatever stupid reason some manufacturers decided to make the tube slightly thicker. IMHO, mil-spec is the way to go. It is easier and you have man options compared to the commercial tube.
sp1shooter  [Team Member]
1/17/2007 10:46:23 PM
Milspec also have a flat end, if you put the tube on its back end on a table it will be straight up. Commercial ones are angled. I hope that makes sense. If I wasn't on dial up a pic would be easier.
MadRyan  [Member]
1/18/2007 1:11:43 AM
Actually, most "Commercial" tubes are about 5/8 longer. In addition to being slightly fatter.
Bumblebee_Bob  [Team Member]
1/18/2007 3:17:46 PM
The terms "Mil-spec" and "commercial" apply only to the carbine length tubes. All rifle length tubes are of the same length and diameter.
AR15barrels  [Dealer]
1/19/2007 12:53:44 AM

Originally Posted By tucansam:
I've seen some buttstock manufactures make reference to their models needing "milspec buffer tubes." I assume there is a milspec and a commercial spec?

Can anyone advise me the differences?


Commercial spec carbine buffer tubes are about 0.025" larger in diameter.
Some commercial carbine buffer tubes have a slanted back end, but they are not 5/8" longer as mentioned above.
They are generally very close in length to a military spec tube.

The 5/8" mentioned is the difference between an M16 or A1 stock and an A2 stock.
A1 and A2 stocks use the same length buffer tube, but A2 stocks have a spacer and use a longer screw.

MadRyan  [Member]
1/19/2007 10:58:42 AM
Actually, you're right and I wasn't clear. One of my "Mil Spec" tubes looks just like any other 5 position mil spec tube, while the other has about 5/8 of material at the end and a slanted saw cut. That's what I was getting at. At any rate, my Magpul CTR won't collapse all the way on that tube but will on my true "Mil Spec" tube. The tube my RRA came with is the same as my longer tube aside from the dia.
AR15barrels  [Dealer]
1/19/2007 11:36:30 AM

Originally Posted By MadRyan:
One of my "Mil Spec" tubes looks just like any other 5 position mil spec tube, while the other has about 5/8 of material at the end and a slanted saw cut.


Any chance that long tube is on an AR-10?

AR-10 carbine tubes are indeed longer.
MadRyan  [Member]
1/19/2007 1:25:47 PM

Originally Posted By AR15barrels:

Originally Posted By MadRyan:
One of my "Mil Spec" tubes looks just like any other 5 position mil spec tube, while the other has about 5/8 of material at the end and a slanted saw cut.


Any chance that long tube is on an AR-10?

AR-10 carbine tubes are indeed longer.


No, it's got the same length bore but it's got a bunch of extra material at the end. It came on my CMMG.
AR15barrels  [Dealer]
1/19/2007 3:35:13 PM

Originally Posted By MadRyan:
No, it's got the same length bore but it's got a bunch of extra material at the end. It came on my CMMG.


Oh, one of THOSE...
I have heard about those.
I heard they are changing the design as soon as they run out of them due to all the length complaints.
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