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Posted: 12/26/2012 10:08:39 PM EDT
[#1]
The difference between the two is in the dimensions on the portion of the tube the stock slides over. A commercial tube only works with a commercial stock and a mil spec tube only works with a mil spec stock. Either tube will thread into your lower.
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Posted: 12/26/2012 10:34:23 PM EDT
[#2]
It wont strip out my lower will it?
I've read that if the threads are the wrong size. they won't properly fit into the low and you can end up damaging the lower by stripping the threads. You got any info about this? |
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Posted: 12/26/2012 10:37:11 PM EDT
[#3]
Every AR I have owned started out with a commercial stock/tube and was later changed to a mil spec stock/tube. If there is a difference at the threaded end it's news to me.
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Posted: 12/26/2012 10:41:10 PM EDT
[#4]
Alright thanks buddy. I'll take your word as truth and order that buffer tube tonight.
The reason I'm ordering it without my lower in hand is because I've read the FFL might require me to turn it into a rifle so the 4473 can be filled out as a rifle. Otherwise I have to go pull A pistol permit up at the local sheriff office. |
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Posted: 12/26/2012 10:42:08 PM EDT
[#5]
There is no difference in the thread. The difference is with the stock body as mentioned above. Commercial w/commercial and Mil Spec w/Mil Spec.
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Posted: 12/26/2012 10:45:59 PM EDT
[#6]
IMHO there is no difference in the strength either, in this climate get what you can.
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Posted: 12/26/2012 11:10:57 PM EDT
[#7]
Quoted: Alright thanks buddy. I'll take your word as truth and order that buffer tube tonight. The reason I'm ordering it without my lower in hand is because I've read the FFL might require me to turn it into a rifle so the 4473 can be filled out as a rifle. Otherwise I have to go pull A pistol permit up at the local sheriff office. A lower is processed as "other " on a 4473. Nothing else is required to build a rifle. It's up to you to change it to a pistol or sbr. If you go that route.
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Posted: 12/27/2012 12:10:30 AM EDT
[#8]
you might want to read through this:
http://www.atf.gov/regulations-rulings/rulings/atf-rulings/atf-ruling-2011-4.pdf If I understand that document correctly, and then personally speaking with an atf agent about this, you can build that lower into a pistol first, then to a rifle, then back to a pistol if you so choose, but at no time, do you want parts to be assembled that would be qualified as an sbr. |
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Posted: 12/27/2012 12:15:18 AM EDT
[#9]
Yeah I understand but in my state we have these old racist laws where the sheriff had the give you a "permit" to buy a pistol.
It was originally intended to keep blacks from owning a firearm. We still have the permit system but they don't really check who's buying anymore. (white or black I mean) so if the gun could be turned into a pistol, alot of FFL's will make sure you're not building one. They won't mark it as "other" to cover their asses ( can't blame em...) So if the FFL decides to play possum. I'll convert it right in front of him to a "rifle" configuration. Edit: I'm in Charlotte, NC |
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Posted: 12/27/2012 3:27:44 PM EDT
[#10]
As you can see in the posted diagram there is a difference in the threads. The commercial tube threads are smaller in diameter. There are folks who think that's a big deal for strength but a quick check in the Machinist's Handbook reveals that the slight difference in thread engagement makes almost no difference in strength. This is likely why the original producers of commercial tubes weren't worried.
There may be, however, a difference in the strength of the tubing. I think it is likely that the commercial tube is some sort of extrusion. The mil-spec tube is likely a forged piece. I doubt the difference is important. |
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Posted: 12/27/2012 4:51:36 PM EDT
[#11]
i am a complete newb.. in fact, first post, but the diagram above looks like there is 15/1000ths difference in the tube diameter at the threaded end... sorry for the newb question but is this just a mistake? Thanks!!
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Posted: 12/28/2012 10:47:01 AM EDT
[#12]
Quoted:
i am a complete newb.. in fact, first post, but the diagram above looks like there is 15/1000ths difference in the tube diameter at the threaded end... sorry for the newb question but is this just a mistake? Thanks!! Correct, the root of the thread is correct on a commercial tube but the threads are a bit truncated because they are cut into a tube which is a smaller diameter than nominal threads. |
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Posted: 12/28/2012 7:52:05 PM EDT
[#13]
What I bought:
7075 T7 ALUMINUM - Milspec |
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Posted: 12/28/2012 10:28:31 PM EDT
[#14]
Thanks, I just pulled mine out of the safe. I don't have calipers handy right now, but I checked to see if my buffer tube ended at a right 90 degree angle. I have milspec.
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