The Firing Line Forums

Go Back   The Firing Line Forums > The Hide > The Art of the Rifle: Semi-automatics

Reply
 
Thread Tools
Old January 19, 2013, 02:03 AM   #1
pumkin
Member
 
Join Date: July 7, 2012
Posts: 83
Buffer tube - full length - ? thread size ?

I'm trying to put together and buy parts for an AR 15. I'm having a hard time comprehending this buffer tube situation. I have a MP 15 lower receiver. I'm looking to buy a full length buffer tube, and put an A2 stock on. Now, so I believe, the major diameter of the male threads on milspec tube is 1.185, and commercial tubes threads are 1.170, difference of .015
This seems like alot. I want a good fit where it threads together. Now, someone just broke news to me full length buffer tubes arent milspec or commercial. If this is true, what thread size is it? What do i need to thread into my S&W mp 15 please??
pumkin is offline  
Old January 19, 2013, 07:27 AM   #2
madcratebuilder
Senior Member
 
Join Date: November 2, 2007
Location: Northern Orygun
Posts: 4,871
Thread diameters are all the same. Tube diameter is different and threads can be rolled or cut.

madcratebuilder is offline  
Old January 19, 2013, 08:34 AM   #3
CTS
Senior Member
 
Join Date: November 6, 2011
Location: NE Georgia
Posts: 1,070
Just buy the A2 stock kit with buffer, tube and spring and it will be fine. The threads in the receivers are all the same and the only thing that matters on M4 style collapsible stocks is the diameter of the outside of the tube. Mil Spec stocks wont fit commercial tubes and commercial stocks will be very loose on a Mil spec tube. Fixed stocks no worries.
CTS is offline  
Old January 19, 2013, 10:45 AM   #4
Quentin2
Senior Member
 
Join Date: June 18, 2009
Location: NorthWest USA
Posts: 1,641
The guys above are right, the threads are the same. A complete A2 kit will fit your lower. Also, there are stocks similar to the A2 (or the slightly shorter A1) that fit your existing S&W milspec tube, assuming you have a complete S&W lower. Magpul just introduced one at the Shot Show that may fit but I'm not 100% which tube it uses.
Quentin2 is offline  
Old January 19, 2013, 12:09 PM   #5
pumkin
Member
 
Join Date: July 7, 2012
Posts: 83
ok, what do you guys think of this kit. I know it doesnt come w/ a stock, but I wasn't able to find one that did that was new. http://www.ebay.com/itm/321057009774...84.m1423.l2649
this is where I got the notion that threads were of diff dia. http://www.google.com/url?sa=t&rct=j...41248874,d.b2I
pumkin is offline  
Old January 19, 2013, 01:46 PM   #6
CTS
Senior Member
 
Join Date: November 6, 2011
Location: NE Georgia
Posts: 1,070
That should work but seems a little steep to me. I actually paid less than that for the complete kit that included the A2 stock. I replaced mine with an Ace skeleton stock so if you want the A2 drop me a PM and I'll tell you about it. that is minus the the buffer, tube and spring.

Last edited by CTS; January 20, 2013 at 10:42 AM.
CTS is offline  
Old January 20, 2013, 01:14 AM   #7
pumkin
Member
 
Join Date: July 7, 2012
Posts: 83
Thanks Slappy, I thank you for helping me out on my threads. I will be PMing you. Yes its steep. Funny thing is, it was nine dollars less when I pasted it on there.
pumkin is offline  
Old January 20, 2013, 08:48 AM   #8
madcratebuilder
Senior Member
 
Join Date: November 2, 2007
Location: Northern Orygun
Posts: 4,871
Quote:
ok, what do you guys think of this kit. I know it doesnt come w/ a stock
At that price you should get the butt stock. Shop around, I know Midway has them in stock, check Rainier Arms and others. $70+/- should buy a complete A2 type RE/butt/buffer.
madcratebuilder is offline  
Old January 20, 2013, 09:00 AM   #9
CTS
Senior Member
 
Join Date: November 6, 2011
Location: NE Georgia
Posts: 1,070
$89 is ridiculous.
Here is what you need"
http://palmettostatearmory.com/index...extension.html
http://www.midwayusa.com/product/910...er-ar-15-rifle
http://www.amazon.com/FSI-A2-Buffer-.../dp/B0071Q3RMY
That's $38 plus shipping. They are all "in stock" as of 10am but don't know how long they will last. It's a shame that no one seems to have it all in one place so you don't have to pay separate shipping on each but that is the nature of things right now I suppose.

Last edited by CTS; January 20, 2013 at 09:49 AM.
CTS is offline  
Old January 20, 2013, 10:11 AM   #10
madcratebuilder
Senior Member
 
Join Date: November 2, 2007
Location: Northern Orygun
Posts: 4,871
Model 1 sales has complete A2's for $55

http://www.model1sales.com/index.cfm...ategory_id=465
madcratebuilder is offline  
Old January 20, 2013, 10:44 AM   #11
CTS
Senior Member
 
Join Date: November 6, 2011
Location: NE Georgia
Posts: 1,070
There you go. Now that I see it, that is the same one I bought for mine. I think it came from midway or somewhere though. One thing about them, even though they say they are black, they actually are an odd gray/green color so I painted mine with semi-flat black spray paint.
CTS is offline  
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 01:54 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2014 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.08703 seconds with 9 queries