Page 4 of 4 FirstFirst ... 234
Results 31 to 38 of 38

Thread: Undergassed?

  1. #31
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    27,217
    Feedback Score
    14 (100%)
    Well it was the GAS TUBE, boys! I ran out to the square range after work and ran several flavors of ammo through it... and re zeroed it.

    Last 20 rounds was PMC bronze shot 2 at a time for a bunch of lock back checks. The gun ran everything great. I could FEEL that it was cycling right.

    Very interesting learning experience.
    "You people have too much time on your hands." - scottryan

  2. #32
    Join Date
    Apr 2011
    Posts
    796
    Feedback Score
    3 (100%)
    Quote Originally Posted by armatac View Post
    So I did learn from it that if you had a way overgassed gun, and for some reason you couldn't fight it with buffers, springs, you could kill some power at the connection with the tube.
    Or you just install an adjustable gas block instead of cobble****ing.

  3. #33
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    27,217
    Feedback Score
    14 (100%)
    Quote Originally Posted by GTifosi View Post
    Or you just install an adjustable gas block instead of cobble****ing.
    Yeah... intentionally creating this problem doesn't warm the heart.
    "You people have too much time on your hands." - scottryan

  4. #34
    Join Date
    May 2009
    Location
    Corpus Christi, Texas
    Posts
    2,251
    Feedback Score
    7 (100%)
    Mark, was this problem with the gas tube on your BCM 14.5"?
    Proven combat techniques may not be flashy and may require a bit more physical effort on the part of the shooter. Further, they may not win competition matches, but they will help ensure your survival in a shooting or gunfight on the street. ~ Paul Howe

  5. #35
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    27,217
    Feedback Score
    14 (100%)
    Quote Originally Posted by jonconsiglio View Post
    Mark, was this problem with the gas tube on your BCM 14.5"?
    Yep! I'm puzzled about it because the gun ran buffers that were WAY heavier than appropriate for the set up in the beginning...

    So either the key wore out the tube, the tube never was in spec.... or the tube was just softer steel. There were no signs of binding... the carrier moves like glass in the upper.

    I'm going to run it like crazy for a few months and watch the new tube.
    "You people have too much time on your hands." - scottryan

  6. #36
    Join Date
    May 2009
    Location
    Corpus Christi, Texas
    Posts
    2,251
    Feedback Score
    7 (100%)
    Quote Originally Posted by markm View Post
    Yep! I'm puzzled about it because the gun ran buffers that were WAY heavier than appropriate for the set up in the beginning...

    So either the key wore out the tube, the tube never was in spec.... or the tube was just softer steel. There were no signs of binding... the carrier moves like glass in the upper.

    I'm going to run it like crazy for a few months and watch the new tube.
    That's interesting. I'm glad it's fixed and I'll be interested to see how it performs over the next couple thousand rounds. I'm going to take a look at me in a few. I don't have any problems, I'm just curious if they used a different tube at one point.

    Thanks buddy.
    Proven combat techniques may not be flashy and may require a bit more physical effort on the part of the shooter. Further, they may not win competition matches, but they will help ensure your survival in a shooting or gunfight on the street. ~ Paul Howe

  7. #37
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    27,217
    Feedback Score
    14 (100%)
    I should get a pic of the old tube... just haven't got around to it. It looks like there never was a step up on the end of it....

    And there's gas fouling from the leakage all over it.
    "You people have too much time on your hands." - scottryan

  8. #38
    Join Date
    Jul 2010
    Posts
    110
    Feedback Score
    0
    Quote Originally Posted by GTifosi View Post
    Or you just install an adjustable gas block instead of cobble****ing.
    I should give one a try but something tells me I will kill it or it won't function after getting red hot. Easy enough to try but I just don't see it working out for my case, for most yes,(but I am going to get one now that I have thought about it, buffers usually do what I need but its way faster to turn a setting than remember parts). With the ammo variations between good and bad that I shoot, that's one of the real draws for a piston setup, I usually port out the silencer setting as I don't shoot suppressed that much.

    Here is a new one I just experienced, yesterday I was using a piston setup and it started dying, found a washer in the chamber, found the rollercam in pieces, didn't see anything wrong, replaced rollercam, 50 rds later same thing, upon further inspection I broke the bottom tooth on the barrel extension, that's a first for me, and it did last about 25K.

    So I pulled out an AR, knocked out a few hundred rounds perfectly, I pulled it out this evening and within 60 rounds the gas tube was connected to the carrier, I guess the roll pin failed and let the tube go, the gun couldn't cycle all the way rearward. A roll pin is a pretty easy fix although I am sure the tube needs a little tweaking after that and I may as well put a new one in.

Page 4 of 4 FirstFirst ... 234

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •