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11/17/2009 7:30:46 PM EDT
I have a Vltor modstock which the receiver tube is 1.15 " diameter with flat back and peaked threads which I assume is milspec.

I have a Magpul commercial stock on a 'commercial' tube with flatter peaks on the threads and the slanted back, but the tube measure 1.15" as well.  The tube also fits in the modstock.  It also has alot of play in the CTR stock until you lock the friction lock.  Anyone else measured their Magpul commercial receiver extensions?  I have another Rock River with a Magpul commercial kit that I will measure tomorrow when I go to my shop.  I might add that there are no problems with this, I am just curious.

11/17/2009 7:56:33 PM EDT
[#1]
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11/18/2009 7:43:06 AM EDT
[#2]
Thanks, but I think you misunderstood my question.  My question is about the specs on the commercial tube from Magpul.  I was pointing out that my Sopmod 'does' fit on it and that the diameter of the tube is smaller than a commercial tube should be, but I bought it as a commercial tube and is has the slanted back.

11/18/2009 7:36:07 PM EDT
[#3]
Quoted:
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Maybe I'm just stupid.
But how can the Dia. of the tube vary from height to width?  None of mine have been elliptical or oblong.
458

11/19/2009 4:18:32 AM EDT
[#4]
Quoted:
Quoted:
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Maybe I'm just stupid.
But how can the Dia. of the tube vary from height to width?  None of mine have been elliptical or oblong.
458



I think one measurement is the bare tube and the other is the threads.
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