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Thread: Question For SIG516 Owners: My SIG516 FDE Gas Block Is Different

  1. #41
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    Quote Originally Posted by everyusernametaken View Post
    Hate to sound like a broken record, but do you have any pics of the interior of the receivers?

    Also, is it an accuwedge between the halves that you're referring to? Or is it something SIG made? This is looking like a really nice rifle, I haven't found one at a local shop yet to handle it.
    Close-up of the lower. The black thingy in the middle is SIG's version of the Accuwedge, but MUCH better. When you press down on it really hard it springs back up b/c it is spring loaded.




    Close-up of the Upper. You can see the part of the piston rod that strikes the Bolt Carrier. It is rounded at the end and fits in the rounded "pocket" of the "carrier key".
    Last edited by DontCome2MyHouse; 07-15-12 at 15:06.

  2. #42
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    Seems like Sig put a bunch of tiny little extras into this rifle. Thinking specifically of stuff like the "accuwedge" or the extractor support in the chamber. I'd be interested seeing how well these run hard.

  3. #43
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    Quote Originally Posted by TCBA_Joe View Post
    Seems like Sig put a bunch of tiny little extras into this rifle. Thinking specifically of stuff like the "accuwedge" or the extractor support in the chamber. I'd be interested seeing how well these run hard.
    I really don't think SIG's version of the Accuwedge is really necessary. If you have a milspec upper and lower that is properly machined it should have a tight fit. My BCM is very tight.

    What is the "fully supported extractor" all about. I read about it in the specs, but I don't understand how it works or the advantage of it.

  4. #44
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    Quote Originally Posted by DontCome2MyHouse View Post
    What is the "fully supported extractor" all about. I read about it in the specs, but I don't understand how it works or the advantage of it.

    If you look inside the barrel extension at about the 2:00 position you'll see a small button in there. This button rests against the extractor when the bolt is locked into battery and keeps the extractor in contact with the case's extractor groove.

    As far as I know, only HK and SIG are using this in their rifles but it seems like a good idea and a simple fix to "extractor bounce." I guess on the other side of the coin, if it did anything to really enhance the M16's reliability other makers would be using it...

  5. #45
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    Quote Originally Posted by Tokarev View Post
    If you look inside the barrel extension at about the 2:00 position you'll see a small button in there. This button rests against the extractor when the bolt is locked into battery and keeps the extractor in contact with the case's extractor groove.

    As far as I know, only HK and SIG are using this in their rifles but it seems like a good idea and a simple fix to "extractor bounce." I guess on the other side of the coin, if it did anything to really enhance the M16's reliability other makers would be using it...
    Wow. I've never noticed that before. Thanks. If HK is doing it then it MUST be a good idea

  6. #46
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    Quote Originally Posted by TCBA_Joe View Post
    Seems like Sig put a bunch of tiny little extras into this rifle. Thinking specifically of stuff like the "accuwedge" or the extractor support in the chamber. I'd be interested seeing how well these run hard.
    TCBA_Joe,

    Have you seen the "Over-The-Beach Test" video? Seems pretty solid.

    http://www.youtube.com/watch?v=FQGTts7xyr8

  7. #47
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    Quote Originally Posted by DontCome2MyHouse View Post
    Wow. I've never noticed that before. Thanks. If HK is doing it then it MUST be a good idea


    Not too surprising that this design would be used in both rifles. That's if the Internet is correct about a former HK engineer going to work for SIG.

  8. #48
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    An interesting PowerPoint on extractor bounce.

    http://www.dtic.mil/ndia/2003smallarms/din.ppt

  9. #49
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    Quote Originally Posted by Tokarev View Post


    Not too surprising that this design would be used in both rifles. That's if the Internet is correct about a former HK engineer going to work for SIG.
    I've noticed that some piston systems feature a spring on the back of the bolt like on the Adams Arms system like this. I've heard of people using this spring on their LWRC.

    What does this spring do and what would happen if I put it on my bolt? Would it hurt to try it?

    Forgot to ask....how is the wear from your cam pin on your SIG516? What is your opinion on the POF Roller Cam Pin?

    Last edited by DontCome2MyHouse; 07-15-12 at 20:05.

  10. #50
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    Quote Originally Posted by DontCome2MyHouse View Post
    Close-up of the lower. The black thingy in the middle is SIG's version of the Accuwedge, but MUCH better. When you press down on it really hard it springs back up b/c it is spring loaded.




    Close-up of the Upper. You can see the part of the piston rod that strikes the Bolt Carrier. It is rounded at the end and fits in the rounded "pocket" of the "carrier key".
    Thank you very much for all the photos. I'm very impressed by what I'm seeing. The re-design of the gas block and regulator/valve really caught my attention from the start, as it addresses one of my concerns from when I checked out one of the 1st gen models in person earlier this year - the threaded fitting. I know people are using the 1st gen 516 with this threaded fitting successfully without major issues, but I just didn't like the feel of it when taking it apart, knowing the effects of heat and crud on threads like this. I really like this new design, and it appears that SIG is listening and improving.

    I'm really digging the FDE cerakote finish too. I was planning for an FDE-themed suppressed piston platform in the near future, and I hadn't even thought of the 516 as an option until seeing this thread and the great photos. This looks like a perfect package for my purposes. I just wonder about availability of an SBR version - anybody know if SIG is making a complete rifle with a short barrel, like 11" or so? I see they sell uppers, but haven't seen complete factory SBR versions of this new 516.

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