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Thread: Gas Issues

  1. #11
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    I pulled the gas block last night and from the marks of the carbon, the gas block could maybe move back about .5-1mm, but other than that, the orifice in the gas block covered the barrel gas port. I realigned them, but don't have much hope for it to work.

    I also ordered a standard carbine buffer and spring to see if that helps things.

    The main issue I think I'll have is that my barrel is pinned, so working with another gas block is a tough option to consider if I don't have to.


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  2. #12
    FaxonNathan Guest
    Quote Originally Posted by MistWolf View Post
    Try Pepto-Bismal



    It could be a misaligned or leaky gas block, leaky gas key, a gas ring problem, an under sized gas port or weak ammo.

    Other possible problems include too much reciprocating mass and/or too much spring rate
    Bingo!

  3. #13
    FaxonNathan Guest
    MistWolf hit the nail on the head for the various likely causes. Know we are here through the successful resolution of any issue and can assist with troubleshooting.

    In the case of the 14.5" barrels, we've genuinely not heard of one being under-gassed, but stranger things have happened.

    Given your troubleshooting steps so far, we would say it is not likely the gas block or gas tube. Easy step to verify would be to clean off the end of the gas tube thoroughly and blow through it. If air comes out relatively easy through the gas block, you are good to go there.

    What we did notice is that no one asked what ammunition was being used?

  4. #14
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    Quote Originally Posted by FaxonNathan View Post
    What we did notice is that no one asked what ammunition was being used?
    You need to read a little closer.
    Quote Originally Posted by JSantoro View Post
    Stop dicking the dog, please. It's gross.

  5. #15
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    Yeah, blow-through and see how that goes.

    I assume you checked the gas tube for cracks/splits as well? Is the tube the right length? Does it engage the bolt carrier fully?

    A 14.5" middy could be sensitive to weak ammo with a fast-burning powder that lets pressure drop too much before the bullet crosses the port. XM193 would be a good check.

  6. #16
    FaxonNathan Guest
    Quote Originally Posted by Ryno12 View Post
    You need to read a little closer.
    Indeed. Dang these young eyes...

  7. #17
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    I've been shooting xm193 IMI I believe. Cycles just fine with three other setups.

    I checked the gas system and blew it out with gun scrubber. I did not notice any cracks. The gas tube seems to be I contact with the BCG, but I should verify that.

    Nathan, you have been awesome in support. I just haven't contacted Faxon directly yet. I'm not entirely sure it's a Faxon related issue.

    Like I said, earlier, I've tried two lowers and three BCG's to verify that the problem stays with this upper.


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  8. #18
    FaxonNathan Guest
    Quote Originally Posted by The FNG View Post
    I've been shooting xm193 IMI I believe. Cycles just fine with three other setups.

    I checked the gas system and blew it out with gun scrubber. I did not notice any cracks. The gas tube seems to be I contact with the BCG, but I should verify that.

    Nathan, you have been awesome in support. I just haven't contacted Faxon directly yet. I'm not entirely sure it's a Faxon related issue.

    Like I said, earlier, I've tried two lowers and three BCG's to verify that the problem stays with this upper.


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    Our pleasure to be of assistance. We're not sure what the issue is either, but will not rule out that it is our issue. If it is found to be, shipping is on us to get the firearm tuned up and sent back.

    Look forward to hearing how the lighter weight carbine buffer fares and let us know if we can troubleshoot in the interim.

  9. #19
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    1. Pictures of the gas block area would have been nice.

    2. 14.5" middy barrels are unforgiving of gas leakage. If there is a leak, they will malfunction rather quickly.

    3. That ammo is usually very hot. If it's not working with that I would be looking at a gas leak somewhere.

    4. I wouldn't necessarily rule out something being out of spec with the lower. Testing is really simple- try another upper on that same lower and another lower with the upper in question. This can help rule out specific issues.



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  10. #20
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    Quote Originally Posted by Iraqgunz View Post
    1. Pictures of the gas block area would have been nice.

    2. 14.5" middy barrels are unforgiving of gas leakage. If there is a leak, they will malfunction rather quickly.

    3. That ammo is usually very hot. If it's not working with that I would be looking at a gas leak somewhere.

    4. I wouldn't necessarily rule out something being out of spec with the lower. Testing is really simple- try another upper on that same lower and another lower with the upper in question. This can help rule out specific issues.
    1. I'll do this after the holidays

    2. Good to know, I may order a new gas tube just to be sure. There is some blow by on the block end of the tube, but it didn't seem excessive. May be too much. Pics later.

    3. That's what I've read.

    4. I've done this with my Sionics lower and my aero lower. Both lowers are flawless with my Noveske 16" middy upper. Both lowers do the same malfunction on aero/Faxon upper.



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