Results 1 to 10 of 10

Thread: Help. Gas tube does not align with barrel nut!

  1. #1
    Senior Veteran
    scottz63's Avatar
    Join Date
    Apr 2014
    Location
    Central Mo.
    Posts
    5,656
    Rep Power
    370

    Help. Gas tube does not align with barrel nut!

    O.K. I need some advice with this one. My gas tube does not align with barrel nut when torqued to proper specs. Used proper grease on threads and torqued to nut to 30 ft. lbs. three times to get proper thread stretch. Started at 30 lbs and worked my way all the way up to the max of 80 lbs in 5 lbs increments. Barrel nut teeth still do not line up with gas tube properly. I did this procedure three times already now. It needs to go a tad more but I can't because I am already at max! What now?
    I know there some choices.

    1. Lap the front of the receiver a bit.
    2. Use barrel shims.
    3. Use a different barrel nut. (have to take off the FSB to do this one. Don't want to.)

    Are there any other options? What would you do?

    Thanks, Scott
    14EH AIT Instructor-PATRIOT Fire Control Enhanced Operator/Maintainer

  2. #2
    Planning's Avatar
    Join Date
    Mar 2007
    Location
    TEXAS
    Posts
    8,381
    Rep Power
    707
    Quote Originally Posted by scottz63 View Post
    O.K. I need some advice with this one. My gas tube does not align with barrel nut when torqued to proper specs. Used proper grease on threads and torqued to nut to 30 ft. lbs. three times to get proper thread stretch. Started at 30 lbs and worked my way all the way up to the max of 80 lbs in 5 lbs increments. Barrel nut teeth still do not line up with gas tube properly. I did this procedure three times already now. It needs to go a tad more but I can't because I am already at max! What now?
    I know there some choices.

    1. Lap the front of the receiver a bit.
    2. Use barrel shims.
    3. Use a different barrel nut. (have to take off the FSB to do this one. Don't want to.)

    Are there any other options? What would you do?

    Thanks, Scott
    OK! first just stop for a little bit.
    Put it up. read this.
    go watch a tv show or something.

    Come back a read this again.
    This is only a suggestion.

    What kind of lube are you using on the threads?

    I try to never take the barrel nut off, Removing the FSB is not a good thing. It is difficult to get it to go back on with the correct line up. It has taken me a lot of time to get it to line up correctly again when I have tried it.

    1. Why shims?
    2. I have never added shims.
    3. why lap the receiver, you are using a standard barrel nut?
    4. I usually torque to 30 to 35#'s, release and re- torque to #40 pounds, This should get you close.
    loosen the nut again and torque to where the hole for the gas tube line almost up on the nut.
    ( I use an old piece of gas tube) where it goes into where the gas tube will go into the receiver.
    I tried the eye ball looking and that never worked for me.
    I need something mechanical in the hole to line it up.
    If you go too far then you have to try again, then it get really hard to hit the next line up.
    Tighten it until the gas tube slide easy in and out and stop tightening.
    I go for any thing over 40#'s and stop.
    I usually hit pretty close to 45"s.
    STOP! That is enough.

    Sounds like you tried to get it too tight to me.
    I have only had to tighten one to just over 45#'s one time.
    Remember Use a breaker bar to tighten the nut. Use the torque wrench to check the tightness #'s..
    Good luck.
    Ron
    Last edited by Planning; 05-13-2016 at 03:05 PM.

  3. #3
    Senior Veteran
    scottz63's Avatar
    Join Date
    Apr 2014
    Location
    Central Mo.
    Posts
    5,656
    Rep Power
    370
    Thanks for the help. I took a break and tried again. I am using moly lithium as per lots of instructions and videos watched. At 30 lbs the tooth of the barrel nut is just starting to get in the way. At 45 lbs the tooth is dead center. At 80 lbs the tooth is almost clear but hitting the gas tube just enough to set it off center.

    I have tried this half a dozen times now. Think I am going to put it up for the day before I do something stupid. Lol

    Edit: It's the barrel nut that came on my new barrel from AR15sport and it's going on my A1 receiver made by NDS.
    Last edited by scottz63; 05-13-2016 at 03:42 PM.
    14EH AIT Instructor-PATRIOT Fire Control Enhanced Operator/Maintainer

  4. #4
    Planning's Avatar
    Join Date
    Mar 2007
    Location
    TEXAS
    Posts
    8,381
    Rep Power
    707
    Quote Originally Posted by scottz63 View Post
    Thanks for the help. I took a break and tried again. I am using moly lithium as per lots of instructions and videos watched. At 30 lbs the tooth of the barrel nut is just starting to get in the way. At 45 lbs the tooth is dead center. At 80 lbs the tooth is almost clear but hitting the gas tube just enough to set it off center.

    I have tried this half a dozen times now. Think I am going to put it up for the day before I do something stupid. Lol

    Edit: It's the barrel nut that came on my new barrel from AR15sport and it's going on my A1 receiver made by NDS.
    What are you using to clamp the receiver?

    What kind (brand) of barrel wrench are you using?

    I just remember a guy having a problem like this.
    He was using a clam shell and had it in the vice too tight and it squeezed the threads out of round just a little.
    some one told him to loosen the vice a little and he was able to get it to work. The clam shell just need to hold the receiver.
    Last edited by Planning; 05-13-2016 at 04:25 PM.

  5. #5
    Senior Veteran
    scottz63's Avatar
    Join Date
    Apr 2014
    Location
    Central Mo.
    Posts
    5,656
    Rep Power
    370
    Tapco wrench, nice heavy one. Wheeler vise block with anti crush insert. I don't have it too tight in the vise, just snug. It's just not lining up for me. I have half a mind to machine off the tooth on the nut, torque it to 45 lbs, and call it done.

    Tapco_AR-15_Armorer_s_Tool.jpg
    ViseBlockClamp.jpg
    Last edited by scottz63; 05-13-2016 at 05:29 PM.
    14EH AIT Instructor-PATRIOT Fire Control Enhanced Operator/Maintainer

  6. #6
    Planning's Avatar
    Join Date
    Mar 2007
    Location
    TEXAS
    Posts
    8,381
    Rep Power
    707
    Quote Originally Posted by scottz63 View Post
    Tapco wrench, nice heavy one. Wheeler vise block with anti crush insert. I don't have it too tight in the vise, just snug. It's just not lining up for me. I have half a mind to machine off the tooth on the nut, torque it to 45 lbs, and call it done.

    Tapco_AR-15_Armorer_s_Tool.jpg
    ViseBlockClamp.jpg
    Use the other half of your mind and don't machine off anything.
    Something is not correct and finding it out before modifying the barrel nut is better.

    The wheeler vise block and insert is what I use.
    The wrench looks like what most are using.

    so, maybe it is something with the barrel.

    I have not had any problems with any of my NDS receivers or heard of anyone that has. ( doesn't mean someone has not)

    I am guessing it is something to do with the barrel nut or barrel.
    I would contact both NDS and where you got the barrel and see if they know of any problems or solutions.
    Having something on a fire arm that is not correct is a scary thing to me.
    If I find something not correct I fix it before using it.

  7. #7
    Veteran

    Roger Davis's Avatar
    Join Date
    Apr 2016
    Location
    Jacksonville Florida
    Posts
    233
    Rep Power
    110
    I wouldnt modify anything either. I have a couple barrel nuts i can send you to see if it would help you get your build done. PM an address, ill get hem one the way. Roger.
    Navy Chief (Retired)

  8. #8
    Senior Veteran
    scottz63's Avatar
    Join Date
    Apr 2014
    Location
    Central Mo.
    Posts
    5,656
    Rep Power
    370
    Going to try again in a little bit after I get some coffee in me.

    Got it!!! Found a tiny little imperfection on the face of the receiver. A slight touch with a jewelers file took care of it. Gas tube lined up perfect right at 45 lbs. Happy now.

    Thanks for the help and suggestions Ron.

    Quote Originally Posted by Roger Davis View Post
    I wouldnt modify anything either. I have a couple barrel nuts i can send you to see if it would help you get your build done. PM an address, ill get hem one the way. Roger.
    Thank you very much for the offer, but I am good now.
    Last edited by scottz63; 05-14-2016 at 07:47 AM.
    14EH AIT Instructor-PATRIOT Fire Control Enhanced Operator/Maintainer

  9. #9
    Senior Veteran Silvera's Avatar
    Join Date
    Aug 2010
    Location
    mountains of NC
    Posts
    1,491
    Rep Power
    456
    locater pin or extrusion is out of spec and is bottoming out on the bbl nut



    ahh just noticed you figured it out....


    Silvera out......
    "Listen With Your Eyes"
    Wit, Grit, Courage and Determination

  10. #10
    Senior Veteran
    scottz63's Avatar
    Join Date
    Apr 2014
    Location
    Central Mo.
    Posts
    5,656
    Rep Power
    370
    Quote Originally Posted by Silvera View Post
    locater pin or extrusion is out of spec and is bottoming out on the bbl nut



    ahh just noticed you figured it out....


    Silvera out......
    Thanks. That's almost exactly what it was. Imperfection on receiver face putting it out of spec.
    14EH AIT Instructor-PATRIOT Fire Control Enhanced Operator/Maintainer

Similar Threads

  1. stars don't align
    By nevada in forum Reloading
    Replies: 11
    Last Post: 01-01-2014, 07:37 PM
  2. Converting a South African FAL barrel to a bipod cut G1 barrel
    By holescreek in forum Build it Yourself/Gunsmithing
    Replies: 6
    Last Post: 06-25-2011, 09:45 PM
  3. Replies: 16
    Last Post: 09-05-2010, 10:20 PM
  4. Replies: 0
    Last Post: 01-01-2009, 09:52 PM
  5. Replies: 5
    Last Post: 10-31-2007, 07:24 AM

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
  •