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Posted: 3/6/2015 7:05:38 AM EDT
[#1]
http://www.specializedarmament.com/products/Receiver_Extension_M4_M4A1_Carbine-144-291.html
4 position, I believe. |
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Posted: 3/6/2015 7:13:01 AM EDT
[#2]
For what it's worth my issue colt M4 has a 4 position stock.
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Posted: 3/6/2015 7:30:47 AM EDT
[#3]
Ask them what spec it adheres to. Then look it up. Could be the anodizing, or sizing, or design, etc. Lots of military specifications.
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Posted: 3/6/2015 7:37:20 AM EDT
[#4]
It refers to the OD and length of the tube. Milspec stocks wont fit commercial tubes and vise versa.
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Posted: 3/6/2015 7:39:12 AM EDT
[#5]
milspec just refers to how it's manufactured if I remember right.
I think milspec has raised threads and a thinner diameter and commercial is sunken threads and a wider diameter. commercial is just made because it's cheaper to manufacture. |
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Posted: 3/6/2015 7:46:58 AM EDT
[#6]
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Posted: 3/6/2015 7:59:39 AM EDT
[#7]
A Milspec is square at the rear (90 degrees)
A commercial is slanted. There is a difference in diameter, but there are more stocks available for a Milspec tube than a commercial Go Milspec or go something 
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Posted: 3/6/2015 8:11:20 AM EDT
[#8]
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Posted: 3/6/2015 8:15:07 AM EDT
[#9]
From Larue's website:
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Posted: 3/6/2015 8:15:29 AM EDT
[#10]
Mil spec is 1.148
Commercial is 1.168 Mil spec has rolled threads Commercial has cut threads |
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Posted: 3/6/2015 8:30:03 AM EDT
[#11]
Quote HistoryQuoted:
Mil-spec has rolled threads From http://www.calguns.net/calgunforum/archive/index.php/t-451497.html http://i655.photobucket.com/albums/uu272/Wiringguy/milspecthread-1.png The amount of derp in that pic is funny If both REs have the same tube ID, and both tubes have threads that are to spec as far as pitch diameter, major and minor diameter, then the wall thickness under the thread minor diameter is the same. If the comm. spec tube were to be machined with a sharp V thread profile vs. an ISO thread form then that would create a weakened area. The structural difference is the fact that the Mil. RE is forged and the comm. RE is machined from billet. |
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Posted: 3/6/2015 8:38:12 AM EDT
[#12]
So many people didnt read the entire OP. Such sad, many idiots.
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Posted: 3/6/2015 8:57:05 AM EDT
[#13]
Quote HistoryQuoted: So many people didnt read the entire OP. Such sad, many idiots.  |
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Posted: 3/6/2015 9:00:21 AM EDT
[#14]
Aren't most commercial one's extruded? Very cheap to do but quite a bit weaker then a Mil spec one.
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Posted: 3/6/2015 9:33:38 AM EDT
[#15]
Some of these parts are being made in China now and they're all kinds of out of spec. Even on the expensive rifles.
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Posted: 3/6/2015 9:50:08 AM EDT
[#16]
The threads are not rolled...
But yeah, 4 pos, 7075 T6 AL... |
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Posted: 3/6/2015 9:57:13 AM EDT
[#17]
Diameter/slant.. already covered.
The asshole that thought of commercial tubes needs a beating. |
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Posted: 3/6/2015 10:03:13 AM EDT
[#18]
There are lots of commercial tubes out there now without a slanted rear end.
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Posted: 3/6/2015 10:12:00 AM EDT
[#19]
Quote HistoryQuoted: Diameter/slant.. already covered. The asshole that thought of commercial tubes needs a beating. The anodizing and dry film on the inside of the tube can be difficult to get right, a reasonable chunk of change can be saved by skipping or skimping on the dry film. |
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Posted: 3/6/2015 11:01:04 AM EDT
[#20]
Quote HistoryQuoted:
Quote HistoryQuoted:
Quoted:
So many people didnt read the entire OP. Such sad, many idiots.
I've been shaking my head at most of the responses. |
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Posted: 3/6/2015 1:55:21 PM EDT
[#21]
Quote HistoryQuoted: The amount of derp in that pic is funny If both REs have the same tube ID, and both tubes have threads that are to spec as far as pitch diameter, major and minor diameter, then the wall thickness under the thread minor diameter is the same. If the comm. spec tube were to be machined with a sharp V thread profile vs. an ISO thread form then that would create a weakened area. The structural difference is the fact that the Mil. RE is forged and the comm. RE is machined from billet. Quote HistoryQuoted: Quoted: Mil-spec has rolled threads From http://www.calguns.net/calgunforum/archive/index.php/t-451497.html http://i655.photobucket.com/albums/uu272/Wiringguy/milspecthread-1.png The amount of derp in that pic is funny If both REs have the same tube ID, and both tubes have threads that are to spec as far as pitch diameter, major and minor diameter, then the wall thickness under the thread minor diameter is the same. If the comm. spec tube were to be machined with a sharp V thread profile vs. an ISO thread form then that would create a weakened area. The structural difference is the fact that the Mil. RE is forged and the comm. RE is machined from billet. I didn't read it just posted for illustration. Possible density of metal not actual thickness? |
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Posted: 3/6/2015 2:18:37 PM EDT
[#22]
Quote HistoryQuoted: I didn't read it just posted for illustration. Possible density of metal not actual thickness? Quote HistoryQuoted: Quoted: Quoted: Mil-spec has rolled threads From http://www.calguns.net/calgunforum/archive/index.php/t-451497.html http://i655.photobucket.com/albums/uu272/Wiringguy/milspecthread-1.png The amount of derp in that pic is funny If both REs have the same tube ID, and both tubes have threads that are to spec as far as pitch diameter, major and minor diameter, then the wall thickness under the thread minor diameter is the same. If the comm. spec tube were to be machined with a sharp V thread profile vs. an ISO thread form then that would create a weakened area. The structural difference is the fact that the Mil. RE is forged and the comm. RE is machined from billet. I didn't read it just posted for illustration. Possible density of metal not actual thickness? 6061 extrudes much easier than 7075, however I really doubt the cost effectiveness of using a 6061 extrusion vs a 7075 impact extrusion, a lot less material/machine time is wasted with the impact extrusion. Edit: Video of receiver extension impact extrusions being made  |
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Posted: 3/6/2015 2:30:11 PM EDT
[#23]
Quote HistoryMagpul has a commercial MOE stock? |
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Posted: 3/6/2015 2:36:18 PM EDT
[#24]
Quote HistoryQuoted: Magpul has a commercial MOE stock? Quote HistoryQuoted: Magpul has a commercial MOE stock? Never shoulda been produced, sheer buggery, nearly fuckin stupid as the LARGE PIN colts. |
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Posted: 3/6/2015 2:40:34 PM EDT
[#25]
Quote HistoryQuoted:
Ask them what spec it adheres to. Then look it up. Could be the anodizing, or sizing, or design, etc. Lots of military specifications. |
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Posted: 3/6/2015 3:47:48 PM EDT
[#26]
Quote HistoryQuoted:
Magpul has a commercial MOE stock? Quote HistoryQuoted:
Magpul has a commercial MOE stock? most, if not all, of their stocks are sold in both sizes |
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Posted: 3/6/2015 4:08:56 PM EDT
[#27]
Quote HistoryQuoted:
Everybody should remove ALL out of spec "commercial" buffer tubes, and crush them, right now. Never shoulda been produced, sheer buggery, nearly fuckin stupid as the LARGE PIN colts. Quote HistoryQuoted:
Quoted:
Magpul has a commercial MOE stock? I'm sure this has been beaten to death somewhere else but can you explain how this is an issue? Will a commercial BT not withstand a butt-stroke to a noodle or is there more to it than that? |
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Posted: 3/6/2015 4:09:45 PM EDT
[#28]
Has anyone ever broken a receiver tube commercial or mill spec?
I've seen the lower receivers break where the receiver tube attaches. |
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Posted: 3/6/2015 6:08:29 PM EDT
[#29]
Quote HistoryQuoted:
Has anyone ever broken a receiver tube commercial or mill spec? I've seen the lower receivers break where the receiver tube attaches. I've seen commercial spec tubes snap off during classes and competitions when the user had to mortar the rifle to clear a jam. |
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Posted: 3/6/2015 6:12:49 PM EDT
[#30]
Screw the mil spec. I just want a 6 position, 7000 series, forged, rolled thread receiver extension.
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Posted: 3/6/2015 10:46:21 PM EDT
[#31]
Quoted:
My clone saga continues, now I need a buffer tube, but which one? I know there is a diameter difference between the milspec and commercial, but that seems to be where the manufacturers seem to stop counting, because I see "milspec" marketed with 4 position, 5 position, and 6 position, just what IS the proper spec? What do the actual US Military M4s ship with? 4, 5, or 6? US Military Colt M4s ship with 4 position tubes. |
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