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When I shoot my 516 with my Saker 762 it doesn't cycle properly when the valve is set to the suppressor setting. There are failures to feed, extract, and the sear often doesn't engage the hammer to keep it cocked. The rifle cycles fine with or without the suppressor when the valve is set to the normal setting. My assumption is that the suppressor setting was configured to work with a 5.56 suppressor so the larger volume of my 7.62 can doesn't provide enough back pressure to cycle the rifle.

Questions:

  • Should I be concerned about accelerated wear using the Saker 762 on the normal valve setting?
  • Is there any potential issue with using the X setting to shut off the piston for the quietest operation? Is it better to use this sparingly or can I use it as often as I want?

The 516 manual didn't cover these questions. I asked SIG customer service about them too but didn't really get any solid answers.



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Posts: 1291 | Location: Inside the Beltway (VA) | Registered: December 09, 2009Reply With QuoteReport This Post
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quote:
Originally posted by photoman12001:
My assumption is that the suppressor setting was configured to work with a 5.56 suppressor so the larger volume of my 7.62 can doesn't provide enough back pressure to cycle the rifle.


This is correct, it's the larger volume and also the larger bore of the 7.62 can that allows it to run with less backpressure than a 5.56 can.


quote:
Originally posted by photoman12001:
Should I be concerned about accelerated wear using the Saker 762 on the normal valve setting?


Are you experiencing significantly faster BCG cycle speed, or increased recoil from the buffer bottoming out? If not then you are fine.


quote:
Originally posted by photoman12001:
Is there any potential issue with using the X setting to shut off the piston for the quietest operation? Is it better to use this sparingly or can I use it as often as I want?


The only issue I could imagine is that the gas port could get blocked with carbon if you fire a substantial number of rounds with the gas valve switched off. I've never seen or heard of this actually happening though and it doesn't seem very likely considering the pressures involved. Shoot a few hundred rounds with it turned off, then switch it back to normal for a couple rounds to see if all functions normally, and then let us know how it went. Cool Worse case scenario is that it takes some extra cleaning to remove any additional carbon build up in the gas valve.




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Posts: 2087 | Location: Ohio | Registered: September 06, 2008Reply With QuoteReport This Post
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Thanks for the input. The recoil didn't seem overly sharp to me with the suppressor. I can't say if the the cycle speed was significantly increased. How might I know if this is the case? I'll have to shoot it some with the piston turned off and see how it does.

I've only put about 100 rounds through it with the suppressor so far. I took it apart yesterday and it was a breeze to clean. I'm a fan of the piston rifles.


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See all my firearm photos at
http://s1274.photobucket.com/u...rearms?sort=3&page=1
-----------------------------------
View a photography demo video here:
http://youtu.be/Iftice_BYlE
 
Posts: 1291 | Location: Inside the Beltway (VA) | Registered: December 09, 2009Reply With QuoteReport This Post
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I shot the 516 on the X piston setting today (turned off) for the first time and had my Saker mounted to it. It was a much more enjoyable experience than I excepted. In fact, I might have enjoyed it more than shooting it suppressed in semiauto. It spits a lot of gas to the face in semiauto and it's still pretty noisy. Of course, it's quieter without the action moving and gas escaping from the ejection port. My wife was shooting in the booth next to me and commented on the difference. I generally shoot rifles prone using a loop sling which is kind of a tight setup that restricts movement (actually the whole point) and I excepted it to be a pain to manipulate the action for each shot. It was actually really easy.

Hopefully there is no risk of damage doing this often because I see a lot of this in my 516's future.


============================================
See all my firearm photos at
http://s1274.photobucket.com/u...rearms?sort=3&page=1
-----------------------------------
View a photography demo video here:
http://youtu.be/Iftice_BYlE
 
Posts: 1291 | Location: Inside the Beltway (VA) | Registered: December 09, 2009Reply With QuoteReport This Post
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