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Thread: Colt 6920 help

  1. #21
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    They do have a proprietary barrel nut and I'll copy/paste the instructions here so you guys can see I'm not crazy

    Installation procedure:

    1. Lock the receiver in an action block or other suitable means. Be careful not to crush it.

    2. Degrease the threaded area of the barrel collar and the interior threads of the larger aluminum
    receiver nut. Some manufacturers use a Teflon coating on the receiver. Wr recommend that you
    remove the coating from the threads with a stainless brushso that the Loc-Tit can bond.

    3. Using the red 271 Loc-Tite, coat the threads of the receiver barrel collar and install the receiver
    extension nut, turning it down until it stops. Then, back it off until the gas tube holes are in alignment.
    Let that set for several hours hour until the Loc-Tit cures. It is important that the extension nut is solid
    with the receiver or it will rotate when you tension the barrel collar against the flange of the barrel.

    4. After the thread locker is set, slip the barrel extension piece into the receiver barrel collar. Make sure the extension piece pin is securely in the 12” locator notch in the receiver barrel collar. Apply a coating of anti-seize
    compound onto the threads of the barrel retainer nut. Failing to do so may
    cause the threads to gall and lock the two nuts together, ruining the aluminum
    receiver extension nut. Slide the steel barrel lock nut over the barrel,
    and turn it by hand until it stops against the extension piece flange. Then, using a standard armorers
    wrench, apply 50 to 80 foot-pounds of torque as necessary to align the lock nut to the gas tube
    channel.

    5. Now, slide the tube over the barrel and onto the receiver extension nut. Index to the screw holes,
    and install the seven 6x32 flat head screws to retain the tube.

    6. Next, install the gas block/gas tube assembly and secure to the barrel by whatever method is necessary.
    Finally, install the brake or flash suppressor if needed.

  2. #22
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    This seems alot like the way that YHM free floating rails are installed. In any case, I never put that crap on.

    Quote Originally Posted by nerul317 View Post
    They do have a proprietary barrel nut and I'll copy/paste the instructions here so you guys can see I'm not crazy

    Installation procedure:

    1. Lock the receiver in an action block or other suitable means. Be careful not to crush it.

    2. Degrease the threaded area of the barrel collar and the interior threads of the larger aluminum
    receiver nut. Some manufacturers use a Teflon coating on the receiver. Wr recommend that you
    remove the coating from the threads with a stainless brushso that the Loc-Tit can bond.

    3. Using the red 271 Loc-Tite, coat the threads of the receiver barrel collar and install the receiver
    extension nut, turning it down until it stops. Then, back it off until the gas tube holes are in alignment.
    Let that set for several hours hour until the Loc-Tit cures. It is important that the extension nut is solid
    with the receiver or it will rotate when you tension the barrel collar against the flange of the barrel.

    4. After the thread locker is set, slip the barrel extension piece into the receiver barrel collar. Make sure the extension piece pin is securely in the 12” locator notch in the receiver barrel collar. Apply a coating of anti-seize
    compound onto the threads of the barrel retainer nut. Failing to do so may
    cause the threads to gall and lock the two nuts together, ruining the aluminum
    receiver extension nut. Slide the steel barrel lock nut over the barrel,
    and turn it by hand until it stops against the extension piece flange. Then, using a standard armorers
    wrench, apply 50 to 80 foot-pounds of torque as necessary to align the lock nut to the gas tube
    channel.

    5. Now, slide the tube over the barrel and onto the receiver extension nut. Index to the screw holes,
    and install the seven 6x32 flat head screws to retain the tube.

    6. Next, install the gas block/gas tube assembly and secure to the barrel by whatever method is necessary.
    Finally, install the brake or flash suppressor if needed.



    Owner/Instructor at Semper Paratus Arms

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  3. #23
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    Quote Originally Posted by nerul317 View Post
    The only reason I was going to use the loc tight was because it was in the instructions that JP sent with the handguard. As far as the gunsmiths go out here near Chicago its hard to find anyone that does this stuff so who knows if the guy was a hack. I'm reluctant to out right blame the guy because ill never really know. All I do know is this is my duty weapon and its cost me a lot of cash at this point. Is this bent index pin something I can remove or replace to salvage the barrel?
    The index pin can be repaired but not by you. It will have to go to a machine shop who also has 1/8 replacement pins.
    Last edited by MarkG; 02-09-11 at 07:52.

  4. #24
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    That's good news as that's something my father in law has access to. Thanks for all the input guys.

  5. #25
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    Since you're in the Chicago area, the only local gunsmith I would trust is Rich Dettelhouser at Canyon Creek Custom. He's in Streator.

  6. #26
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    That is good to know sir. Thank you kindly for that info. Its tough to find people that offer those services in this unfortuneate gun hating state.

  7. #27
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    After reading some of these threads on this forum, I thought all Colts were infallible? I'm devastated.

  8. #28
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    What is that supposed to mean?

    Quote Originally Posted by nhp1127 View Post
    After reading some of these threads on this forum, I thought all Colts were infallible? I'm devastated.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  9. #29
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    Quote Originally Posted by Iraqgunz View Post
    What is that supposed to mean?
    Relax, sarcasm.

  10. #30
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    I am relaxed. Your snide sarcasm isn't welcome. So please start to make some posts of substance or find the door.

    Quote Originally Posted by nhp1127 View Post
    Relax, sarcasm.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

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