Switch from Commercial to Milspec Buffer tube?

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Advoc

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So apparently all the rage about 4 or 5 years ago was that if you were running a Milspec AR you had like 3 options, and if you were running commercial you had any choice you wanted.

I go to the gun show in Calgary this April and NOBODY has any commercial stuff in stock, the entire AR world decided at the drop of a hat to drop the Commercial buffer tube?

Well I've bought a Norc CQA (the kind with the ambidextrous mag release), and have all the furniture on it that I want. A nice MOE SL handguard that was a PITA to put on (needed a new Delta Ring), a K-2 grip and my See-All sight. The final piece is one of those fixed CTR stocks from Magpul, but I can't find any that are commercial.
The local guy in town has a stack of them in his counter that are milspec.

So... If I want to switch to a milspec buffer tube, is there anything else I need? I'm assuming the spring and buffer don't need to be switched? What about the castle nut and plate?

[url="http://i.imgur.com/7aqyc2C.jpg?1]PIC[/url]
http://i.imgur.com/7aqyc2C.jpg
 
I think you have that reversed: commercial tubes always had more limited options than mil-spec tubes. All you need to do is switch the tube - everything else remains the same. If you didn't have to dremel any of the parts to get them to fit, congratulations - you're in the 1%.
 
I thought CTR were multi position for a carbine tube (pretty sure that's the model I have on my 9mm AR). If he wants the fixed magpul rifle stock he needs the rifle tube. I have them both plus a few others.
 
There seems to be a bit of confusion here.
Advoc said:
The final piece is one of those fixed CTR stocks from Magpul, but I can't find any that are commercial.
Click to expand...
blaxsun said:
He said he wanted a fixed Magpul stock, so either he means the rifle MOA or the CTR.
Click to expand...

I think MOA is just a typo and CTR is adjustable

CTR (Compact Type Restricted) is an adjustable carbine length stock, come in both Mil-Spec and Commercial-Spec

MOE Stock (Magpul Original Equipment) is an adjustable Carbine length stock, come in both Mil-Spec and Commercial-Spec

MOE Fixed Stockis the fixed stock, comes in 3 flavors "MOE Rifle Stock", "MOE Fixed Carbine Stock Mil-Spec" and "MOE Fixed Carbine Stock Commercial-Spec".

A2 fixed rifle stock only comes in Mil Spec so there is no such thing as a Commercial version and as cr5 have pointed out above you will need a rifle length extension tube, rifle length buffer and rifle length buffer spring.

Carbine stock you will need a castle nut wrench and a new Mil Spec buffer tube.
 
This one:

https://www.magpul.com/products/moe-fixed-carbine-stock-mil-spec

I suppose what I should have said was "the one that looks like a CTR stock but is fixed instead of adjustable"

I'll check out questar. If they have a commercial then I'll just buy one and be done with it. Thanks.
 
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When it comes to firearms, consumers often wonder about military-grade and commercial-accessible parts. Both mil-spec and commercial buttstocks are widely available, but minor differences may hinder a firearm enthusiast’s satisfaction.

Understanding key differences is important, chiefly for collection purposes, as commercial and mil-spec buttstocks are very similar.


Size

Commercial and mil-spec receiver extensions differentiate in size. A completely mil-spec firearm tube is created from 7075-T6 alloy, which provides 1-3 and 16-16 UN thread rolls.

Commercial-spec additions were created to reduce the firearm owner’s overall costs, as the extension is manufactured from an extruded tube. The tube features a welded-on cap, normally made from a lesser metal. These threads match the mil-spec’s 1-3 and 16-16 thread. These buttstocks are a little longer, and in many cases, are a bit more slanted.

Both the Mil-spec and Commercial tubes will work on all AR-15 receivers. However, due to manufacturing processes, the threads on the commercial tubes are weaker than the ones on the mil-spec tubes.


Diameter

Commercial-spec buttstock tubes, in which the buttstock goes around to attach to the rifle, have a diameter of 1.168”, while the Mil-spec is slightly smaller and has a diameter of 1.148”. A buttstock designed for one size tube will not work on the other.
 
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