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CTR on Sig 516 mil-spec buffer tube is loose

This is a discussion on CTR on Sig 516 mil-spec buffer tube is loose within the SIG Sauer Rifles forums, part of the SIG Sauer Forum category; Okay so a mil-spec buffer tube is 1.15" and a commercial buffer tube is 1.17" My Sig516's mil-spec buffer has been machined by Sig slightly ...


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Old 11-21-2012, 07:37 PM   #1
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CTR on Sig 516 mil-spec buffer tube is loose

Okay so a mil-spec buffer tube is 1.15" and a commercial buffer tube is 1.17"

My Sig516's mil-spec buffer has been machined by Sig slightly undersized to 1.145" and the CTR stock I just installed to get rid of the wobbly MOE also wobbles.

Sigh.

Anybody know where I can get a 1.15" mil-spec buffer tube or should I send my CTR stock back to Amazon and try another?

For reference, I hammered out the roll pin in the CTR and stuck a shim in to try to make the CTR clamp tighter and while it did camp tighter, the problem is really in the slightly under-sized tube.

I looked at DPMS, here in Minnesota and their buffer tube is machined to 1.14", which would make for an even bigger wobble.

Any suggestions for chasing down a real, live 1.15" mil-spec buffer tube would be welcomed.

Last edited by EricTheOracle; 11-21-2012 at 07:41 PM.
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Old 11-22-2012, 06:23 AM   #2
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Eric, call Sig and tell them about it, I have the CTR on mine and all though no wobble, it does not bite as well as it does when i swap it to another MIL SPEC tube.It seems to be maybe they might have low bid the tubes out, and should really measure their vendors inventory before accepting them. I also have a friend who had to send back the stock and just put the original back on and said to hell with it.I love the Sig product , and know the C/S dept does try to be very helpful and fix any problem that seems to come from manufacturing,and ALL manufacturers including the big high end ones have their flaws in fit and finish. If not calling Sig, i would think you could get a quality buffer tube from any decent parts warehouse like Brownells or Midway.Check with the other AR 15 manufacturers,Colt,Ruger,RRA,shouldnt be too hard to find a decent one that has been measured for spec.
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Old 11-27-2012, 08:54 AM   #3
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Follow-up:

I spoke to Josh, a CS guy at Sig, and Josh told me I could send in the entire weapon and they'd look at it because Sig does not have buffer tubes to send out. Given the uncertainty that Sig would resolve my problem, I would rather order a mil-spec buffer tube and install it myself.

Manufacturing wise, the process engineer oversees setting up the line and getting each machine tool (which has its own "personality" due to wear and tolerances) set up. Quality engineers should be doing spot checks to confirm that the machine tools are still spitting out in-spec product.

Casting is so much more accurate than machining.
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Old 12-20-2012, 08:43 PM   #4
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Further follow-up:

I purchased a UTC "Made in America" Model 4/15 buffer tube through Amazon and the new buffer tube is in spec and the CTR has no play.

Amazon.com: UTG Pro Mil-spec 6-position Receiver Extension Tube: Sports & Outdoors
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Old 12-21-2012, 09:24 AM   #5
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Hmm good to know my sig has some play in the stock all so goona go and measure the buffer tube. I would of never thought that a .oo5 play in tolerance would do that
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Old 12-21-2012, 12:31 PM   #6
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Neither did I at the start of my quest to de-wobble my stock.
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