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

  1. #11
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    As requested , these are the pics of my SIG516 Gas System and BCG.

    On this photo I would like to know if lube should be applied to this area behind what looks to be mini gas rings. They even have gaps that are staggered just like the gas rings on the bolt. Obviously no lube would go on the face of the gas piston in front of those rings.


    Rear of the same rod.

    The Piston (right) goes inside the Gas Valve (left). Again, you can see those mini gas rings on the Piston. Because of those rings when the Piston and Gas Valve are together it creates a seal that requires a little bit of force to pull apart (just like when removing the Bolt from the Bolt Carrier). This is why I'm thinking there SHOULD be lube on those mini gas ring, but I could be wrong. You can also see carbon fouling on the face of the Piston where it was tested at the factory.


    This is the Gas Valve. I did some contrast editing so you folks could see the holes better. Notice how the medium sized hole has some "burning" around it. It's the ONLY one that does. This, to me, is even more evidence that the medium sized hole (not the large hole stated in the users manual) is the NORMAL setting as it is the only hole that shows that burn mark around it from where it was tested at the factory.


    When I removed the BCG, I noticed that the color was different from any other BCG I have. It's not black at all, but rather a deep brown-bronze color. You might be able to tell from the photos. Also, after drying the BCG off and before applying my Slip2000 EWL, I noticed the all surfaces of the Bolt Carrier only (not the bolt itself) has a VERY slick feel. The color combined with the "dry, but wet" feel leads me to believe that there is some type of special coating on this Bolt Carrier. Can anyone confirm this?






    This is one of the reasons I went with the SIG516. It uses a standard Bolt, unlike the HK416. But unlike the HK416, the SIG516 didn't kill Usama bin Laden. I do know from other users that the gas rings on the Bolt are optional and the rifle will run fine without them. This was confirmed by SIG. I just left them on b/c I didn't feel like taking them off.
    Last edited by DontCome2MyHouse; 07-12-12 at 15:21.

  2. #12
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    I would lube the entire piston and rod. And yes to lubing the part you indicated on the picture. Not exactly the same system, but I lube the entire piston and oprod on my HK416. All gliding surfaces should be lubed.

    How much of the oprod/piston goes inside of the valve?

    Did you not get an "Operators Manual", that includes a lubrication scheme?

  3. #13
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    Quote Originally Posted by Arctic1 View Post
    I would lube the entire piston and rod. And yes to lubing the part you indicated on the picture. Not exactly the same system, but I lube the entire piston and oprod on my HK416. All gliding surfaces should be lubed.

    How much of the oprod/piston goes inside of the valve?

    Did you not get an "Operators Manual", that includes a lubrication scheme?
    Thanks for the info. I will do that then.

    Just that small portion on the rod where I put "Should I lube here?" goes inside the valve.

    The Operators Manual that came with it was obsolete b/c mine SIG516 came with the "new" piston design (same as the new SIG716). The undated Operators Maunal that was sent to me via PDF from SIG is very vague and doesn't tell specifics on that rod. It just basically says "lube the Piston rod". I want details!!

    Does your HK416 have those mini gas rings on the piston rod like mine does? How similar is your system?
    Last edited by DontCome2MyHouse; 07-12-12 at 15:17.

  4. #14
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    It sort of similar, but our piston and rod are two separate parts, and the valve/regulator is part of the gas block:

    Piston (you can see the gas rings just below the nipple:


    Oprod (didn't have a pic on hand):


    Old gas regulator(you can make out the holes on the regulator that mate up with the port on the barrel):



    New gas regulator:



    Ours is not adjustable for use under adverse conditions though, only for suppressed/unsuppressed use.

  5. #15
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    Just got off the phone with SIG Customer Service. The guy said the new manual IS correct and that NOW the Normal setting is at the 10 and 4 o'clock position and Adverse is 12 and 6 o'clock.

    I'm so freakin confused now I can't see straight. He also said the best way to really find out is to shoot it and feel the differences. Looks like I'll be doing a range trip here soon.

  6. #16
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    Oh. My. God.


    SIG Customer Service just called my cell phone and told me I was CORRECT! Apparently, just like I suspected, the pictures WERE INDEED SWITCHED by accident. The CS guys got the call from the local SIG516 expert on hand and told him I was correct and that it needed changed before going to print.

    Mystery solved. Vertical 12 and 6 o'clock position is Normal setting. 10 and 4 o'clock position is Adverse. . End of story.

  7. #17
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    Nice, thanks for the detailed pictures. I'm impressed with this setup, I wasn't aware they were updating it. I had checked out one of the old design 516s at a local shop, it seemed to be pretty well-made,, but yours looks a lot nicer.

    Good catch on the misprint. I never really trust what I read until I've done a sanity check. Seen a lot of issues with manufacturer documentation over the years, and learned the hard way years ago to verify everything. Thanks for posting this information.
    Last edited by everyusernametaken; 07-12-12 at 17:23.

  8. #18
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    Can't say I'm a fan of that rail at all. But other than that, it looks like an interesting alternative to a designed to be piston AR (MR223/LWRC/SR556/etc). It's nice to see a little refinement from Sig and a gas block with plenty of options.

    This and the HK are probably the only two I would consider, and for the money and weight, there isn't much in HK's favor other than it's a mil issued weapon so it's known good.

    If SIG paints this thing "rainbow" or whatever I'm out though
    Last edited by Noodles; 07-12-12 at 17:46.

  9. #19
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    I forgot to mention when I was on the phone with SIG Customer Service he said my SIG516 was Gen2 and previous designs are Gen1. Guess I got lucky.

    It's strange that SIG doesn't mention this on their website.

  10. #20
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    Quote Originally Posted by Noodles View Post
    Can't say I'm a fan of that rail at all. But other than that, it looks like an interesting alternative to a designed to be piston AR (MR223/LWRC/SR556/etc). It's nice to see a little refinement from Sig and a gas block with plenty of options.

    This and the HK are probably the only two I would consider, and for the money and weight, there isn't much in HK's favor other than it's a mil issued weapon so it's known good.

    If SIG paints this thing "rainbow" or whatever I'm out though
    I have a SIG516 10" CQB Upper that is on back-order right now that I ordered in January. I asked SIG why so long and they told me they are back-logged filling military orders for the SIG516. So, the SIG516 is a military issued weapon, but I'm not sure WHICH military placed the order. It might be a foreign military. Considering it's about half the cost of a HK416 and it passed the "over-the-beach test" was enough to sell me. When I read that the HK416 (MR556) weighs about 9 lbs out of the box with NOTHING on it....I said I'll pass.
    Last edited by DontCome2MyHouse; 07-12-12 at 18:06.

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