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New Member, New Gun, New Problems... (Sig 716)

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11 years 7 months ago #21232 by mrraley
Replied by mrraley on topic New Member, New Gun, New Problems... (Sig 716)
something for you to try...

load one round in the magazine. fire said round. see if the bolt locks back after said round.

do this with both the ammos that you are have issues with.

If the bolt does not lock back after it has been fired, it is a good indicator that the ammo itself might be underpowered.

I would suggest using an ammo that is a minimum of 150gr up to 168gr. go with small doses and experiment with different rounds to see what works best.

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11 years 7 months ago #21239 by LebbenB
Replied by LebbenB on topic New Member, New Gun, New Problems... (Sig 716)
One other question - What does your ejection pattern look like? Does the case eject strongly (3-4 feet from the rifle) or does it sort of weakly pop out of the ejection port?

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11 years 7 months ago #21240 by Siscowet
Replied by Siscowet on topic New Member, New Gun, New Problems... (Sig 716)

mrraley wrote: something for you to try...

load one round in the magazine. fire said round. see if the bolt locks back after said round.

do this with both the ammos that you are have issues with.

If the bolt does not lock back after it has been fired, it is a good indicator that the ammo itself might be underpowered.

I would suggest using an ammo that is a minimum of 150gr up to 168gr. go with small doses and experiment with different rounds to see what works best.

Interesting that the same thing cropped up with the 516 when 55 gr cartridges were used instead of 62 gr. mrraley might be right. Especially if Sig did not optimize it for lighter cartridges. One would think that the adjustable gas settings on the 716/516 would compensate for that, but it does not seem to. I am wondering if it may be an issue with the size or configuration of the gas bloc in Sigs. If not a mag issue, it sounds like not enough force is being directed against the bolt carrier group to fully cycle the weapon. Some other website commentators feel breaking it in with heavier bullets is the way to go, and that eventually tolerances and resisting friction in the gas system will dissipate. One great thing about Armalite are their tech papers they routinely publish. If Sig is not doing that, they should be, especially with problems like this cropping up. Again good luck, and stay on the forum, we welcome new members.

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11 years 7 months ago #21241 by OleCowboy
Replied by OleCowboy on topic New Member, New Gun, New Problems... (Sig 716)
Like most x 2 on looking at the mag first.

THe fact that you can get the weapon to properly function using a brand of cart. I would STRESS test that. Load up a couple of mags with you working brand and do a rapid fire, try rocking the mag and firing etc, etc. What you are trying to do is see if the working brand will possible duplicate what is happening with other brands. If not, then we can mostly assume the weapon itself is functioning properly. Point being can we safely eliminate the weapon itself.

This brings us to the all too often wild card mags. Mags are mass produced items subject to issues, being dropped, bent, torquing and a host of things that can cause a malfunction.

Try various mags looking for a difference in stress testing. Possible that that mag has a minor flaw.

Can you buy different make of cart with the same bullet design and wt? Test those.

What ever is wrong is probably due to something very minor, so minor in fact that some cart work, some don't and that is what you are trying to solve for.

Do a comparo using a digital mic to see if there are any differences in the rds themselves that could affect performance.

Can you rock the mag in the mag well after its install, can you cause or not a malfunction. Is there is vertical play with the mag?

There is the possibility the mag well is outside specs in some component. This can be due to not fully machining or over-machined. (Before I was a computer engineer I was a machinist, AFL-CIO-IAM. I was also racing back in those days and I was breaking the 2nd gear syncro ring on a Muncie M 22 on a all too often basis. I got to where I could pull it, rebuild it and have it back in within the 1 hour allocated time at the track. I went to stronger syncro rings and problem not solved. It only occurred when racing on the 1 - 2 shift. What we found out after a lot of work and replacements were the 3 shift dogs that connected to the syncro ring, one was longer than the other two by about .003, ground it down and solved my problems)

Point being and based upon your discussion points it would appear that if you mags are good then it could be a minor machining issue and sometimes 3 1/1000ths makes all the difference. Inspect your mag well for burrs or rough edges etc...

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11 years 7 months ago #21243 by 13fcolt
Replied by 13fcolt on topic New Member, New Gun, New Problems... (Sig 716)
Another thing to note, does the malfunction happen at the same round count? For example, it is consistently the first few rounds, half way into the mag, or near the end?
Does the malfunction happen if you down load the mags by 1 or 2 rounds?

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11 years 7 months ago #21245 by Dabu
Replied by Dabu on topic New Member, New Gun, New Problems... (Sig 716)
Since nobody has mentioned it yet, don't store your magazines with ammo in them :)

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11 years 7 months ago #21248 by OleCowboy
Replied by OleCowboy on topic New Member, New Gun, New Problems... (Sig 716)

Dabu wrote: Since nobody has mentioned it yet, don't store your magazines with ammo in them :)


I have heard that before, do you have any basis for that? Thanks

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11 years 7 months ago #21250 by Dabu
Replied by Dabu on topic New Member, New Gun, New Problems... (Sig 716)
Once upon a time, I used to have FTF issues in an 1911 magazine I used to have. Other mags preformed as advertised. Then I stopped storing it loaded, then after a month it didn't have FTF issues anymore. I'm just guessing the spring got used to it being compacted and it didn't put another round up as quick as it should have.

I might be wrong, but its a free test. :)

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11 years 7 months ago #21254 by Siscowet
Replied by Siscowet on topic New Member, New Gun, New Problems... (Sig 716)

Dabu wrote: Since nobody has mentioned it yet, don't store your magazines with ammo in them :)

I store at least two loaded for my readily accessible weapons for home defense, figure they are sacrificial at least. Rest are cleaned, oiled, and stacked in a humidity controlled environment, just like most my firearms.

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11 years 7 months ago #21259 by 10-76
Replied by 10-76 on topic New Member, New Gun, New Problems... (Sig 716)
Faulty gas block.

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