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.
![]()











. 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.
Reply With Quote






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.

Bookmarks