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AR15.COM
5/18/2012 2:07:36 PM EDT
Well I have a question, is the ubr stock mil spec? and if not what keeps if from being mil spec? The buffer tube included with it is a entry length buffer tube, what does this mean? I am wanting to put this stock on my colt 6940 so could I use the buffer tube from that gun? I am new to AR's so I am trying to figure out if this will work or not
5/18/2012 2:47:24 PM EDT
[#1]
I cannot tell you if it's "mil spec" but I can tell you it will not work with your Colt buffer tube because of the way it attaches. I can also tell you, if I'm allowed, that I happen to have a UBR that I replaced with an STR and am considering selling.
5/18/2012 3:07:55 PM EDT
[#2]
Not milspec. Entry buffer tube is a carbine length buffer tube without the rail on the bottom for a collapsable stock. I.E. a short rifle tube (which also do not have mil spec or commercial varieties).
5/18/2012 4:57:59 PM EDT
[#3]
Quoted:
Well I have a question, is the ubr stock mil spec? and if not what keeps if from being mil spec? The buffer tube included with it is a entry length buffer tube, what does this mean? I am wanting to put this stock on my colt 6940 so could I use the buffer tube from that gun? I am new to AR's so I am trying to figure out if this will work or not


"Mil spec" and "commercial" are used to describe the external diameter of two different, but similar looking carbine receiver extensions.

The UBR uses a rifle type extension that is shortened work with the carbine buffer system. This is called an "entry" length receiver extension.
6/16/2012 9:19:32 AM EDT
[#4]
Quoted:
Quoted:
Well I have a question, is the ubr stock mil spec? and if not what keeps if from being mil spec? The buffer tube included with it is a entry length buffer tube, what does this mean? I am wanting to put this stock on my colt 6940 so could I use the buffer tube from that gun? I am new to AR's so I am trying to figure out if this will work or not


"Mil spec" and "commercial" are used to describe the external diameter of two different, but similar looking carbine receiver extensions.

The UBR uses a rifle type extension that is shortened work with the carbine buffer system. This is called an "entry" length receiver extension.

And it's proprietary to the stock/mounting system.
6/16/2012 5:22:38 PM EDT
[#5]
Quoted:
Quoted:
Quoted:
Well I have a question, is the ubr stock mil spec? and if not what keeps if from being mil spec? The buffer tube included with it is a entry length buffer tube, what does this mean? I am wanting to put this stock on my colt 6940 so could I use the buffer tube from that gun? I am new to AR's so I am trying to figure out if this will work or not


"Mil spec" and "commercial" are used to describe the external diameter of two different, but similar looking carbine receiver extensions.

The UBR uses a rifle type extension that is shortened work with the carbine buffer system. This is called an "entry" length receiver extension.

And it's proprietary to the stock/mounting system.


Not really proprietary, as there are other stocks from different manufactures that also use this tube such as the Sully Stock.
6/17/2012 2:39:25 PM EDT
[#6]
Sorry, I meant proprietary in that you must use that tube to mount that stock... To be fair, it's been a long tome since I mounted my UBR, I can't remember if the system that mounts the Stock Body is molded onto the tube or the tube is a separate piece that the mounting system mounts to...
Quoted:
Quoted:
Quoted:
Quoted:
Well I have a question, is the ubr stock mil spec? and if not what keeps if from being mil spec? The buffer tube included with it is a entry length buffer tube, what does this mean? I am wanting to put this stock on my colt 6940 so could I use the buffer tube from that gun? I am new to AR's so I am trying to figure out if this will work or not


"Mil spec" and "commercial" are used to describe the external diameter of two different, but similar looking carbine receiver extensions.

The UBR uses a rifle type extension that is shortened work with the carbine buffer system. This is called an "entry" length receiver extension.

And it's proprietary to the stock/mounting system.


Not really proprietary, as there are other stocks from different manufactures that also use this tube such as the Sully Stock.