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Discussion Starter · #1 ·
So I have had my DMR a little over a week. I haven't had a chance to bring int to the range yet. I have been getting the scope set up, the case foam cut out, and just taking the rifle apart and learning about how it functions.

So here is my question, I know the switch on the front of the gas block has two settings. One setting for regular use and one setting for if the rifle is extremely dirty and needs more pressure to cycle.

When I took the switch out to inspect it and the piston/tube assembly I noticed there is only a hole in the regular position. I would expect a larger gas hole for the second setting. Look at the picture below and tell me what you think. The only hole on the part is the one you see.

 

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Maybe they designed it with gas shut off capability instead of fouled operation capability?
 

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Discussion Starter · #4 ·
Just an update. I spoke with Sig support today, they verified that it should have two holes. They are sending me a new one. :D
 

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95blklsc said:
Just an update. I spoke with Sig support today, they verified that it should have two holes. They are sending me a new one. :D
Who did you speak with at SIG? Did you have to send them that photo, or did they just believe you on the spot. I wonder if they have had this problem come up before.
 

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Discussion Starter · #8 ·
I didn't have to send the the picture or anything, hell i didn't even have the serial number with me since i was at work. They didn't say if it was something they have heard of. The service rep just said he will be sending me a new one and I didn't need to send the old one back.
 

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me too

I just had to call Sig today for a new 1 for the same reason on my DMR.
 

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Discussion Starter · #12 ·
The replacement just came in. No markings on it at all, and the surface finish is totally different. The one that came with the DMR is a matte gray finish and this is a somewhat polished machined surface. Also, there isn't any lettering embossed in it like the stock DMR one. I wonder what the reason difference is, I don't think it was an oversight.

 

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That first one would be very handy if you were running hand loads and didn't want the brass to be beat to crap. Or a supressor and didn't want to bolt to cycle.
 

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Discussion Starter · #14 ·
Yea I was thinking the same thing. It will be nice having both. I'm going to leave the stock one in there for now, but I'll have the other one just in case.
 

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I just purchased a 556 DMR and had the same single hole position for the gas valve. After reading your post I called customer service and spoke with Victoria who checked with a gunsmith and told me that the DMR has a different configuration from other 556 models and does not need a hole at the second setting of the gas valve.





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fast34 said:
I just purchased a 556 DMR and had the same single hole position for the gas valve. After reading your post I called customer service and spoke with Victoria who checked with a gunsmith and told me that the DMR has a different configuration from other 556 models and does not need a hole at the second setting of the gas valve.
Um, call me skeptical, but that just doesn't sound right. Not unless they expect a DM to clean their rifle religously and Macgyver cleaning supplies. I'd not want one without an emergency setting, even though I plan to never need it. It may have a different trigger, but it has the same gas system. I'd give Sig a call back and ask for a 2position gas valve.

If they tell you the gas valve has a 2nd detent without hole to single shoot, tell them you can simply do that by turning it to 10o'clock.
 
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