Page 1 of 2 12 LastLast
Results 1 to 10 of 15

Thread: DIY Magpul UBR Installation Question

  1. #1
    Join Date
    Feb 2010
    Location
    Squirrel!
    Posts
    2,156
    Feedback Score
    3 (100%)

    DIY Magpul UBR Installation Question

    This may seem like a dumb question, but since many people have done their UBR installations themselves, I thought I'd ask it anyways...

    How important is it to properly torque down the entry receiver extension with the UBR to the specified 35-39 ft/lbs? Is "hand-tightened" good enough? I'm attempting to install a UBR to a lower and I don't have a torque wrench.

    If one is absolutely required, what's a good, cheap place to buy one, and how do I get the socket-style attachment to fit the back of the receiver extension?

    Thanks!

  2. #2
    Join Date
    Aug 2009
    Posts
    85
    Feedback Score
    24 (96%)
    Hand tightened is not, IMHO, good enough. The torque settings are optimized to prevent back-out or loosening under repeated recoil.

    As far as buying cheap, I would shy away from that approach and instead invest a little in a good quality tool with an iron-clad lifetime warranty like Craftsman or Snap-On. Lowe's ad Home Depot have their store brands (Husky and Kobalt respectively) that are well made and offer good replacement coverage as well.

    The receiver extension tube "socket" is not available as a part in and of itself, but instead is part of a tool like the RRA castle nut wrench. You simply place the square tool end of the torque wrench into the appropriate cut out on the tool and use the cut out that fits on to the receiver tube end. Easy as can be!

    Good luck!

  3. #3
    Join Date
    May 2009
    Location
    Jacksonville, FL
    Posts
    241
    Feedback Score
    7 (100%)
    You can rent a torque wrench from Auto Zone for free (You have to put down a $100 refundable deposit)

  4. #4
    Join Date
    Dec 2008
    Posts
    5,117
    Feedback Score
    7 (100%)
    I have hand tightened 3 of them now, never had a single problem with any of them and one of my goes back to the preproduction models

    I should add that I did use a wrench to do it but just did not go crazy on them. It was not a torque wrench.
    Last edited by ALCOAR; 08-04-10 at 17:28.

  5. #5
    Join Date
    Nov 2008
    Location
    NM
    Posts
    3,988
    Feedback Score
    10 (100%)
    I went and idiot-gorilla'd mine in, and have had zero problems as well.
    عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
    کله چی سلاح منع شوی دی، یوازي غلوونکۍ یی به درلود
    Semper Fi
    "Being able to do the basics, on demand, takes practice. " - Sinister

  6. #6
    Join Date
    Jan 2008
    Location
    AZ-Waging jihad against crappy AR's.
    Posts
    24,902
    Feedback Score
    104 (100%)
    You don't need a torque wrench. Tighten it by hand. Then use a wrench and snug it up good. If you do everything correctly it won't come loose.



    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

  7. #7
    Join Date
    Mar 2010
    Posts
    103
    Feedback Score
    0
    I hand tightened with some blue loctite. 4000+ rounds so far, 2000 of those this last weekend at a course.

  8. #8
    Join Date
    Jan 2008
    Location
    AZ-Waging jihad against crappy AR's.
    Posts
    24,902
    Feedback Score
    104 (100%)
    I am glad it's working for you, but Loc-Tite is the wrong answer.

    Quote Originally Posted by Xhado View Post
    I hand tightened with some blue loctite. 4000+ rounds so far, 2000 of those this last weekend at a course.



    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. #9
    Join Date
    May 2008
    Location
    Colorado
    Posts
    13,167
    Feedback Score
    0
    I'm sure that Mr. Murphy can strike at any time, but the UBR extension isn't like a carbine receiver extension.

    I guess the screw at the back could loosen and let the extension start to rotate, but that stock would start to feel all kinds of funky and loose fast.

    I've never heard of a UBR loosening- has anyone?

    What is the Mark 1 Mod 0 spec for hand tightening?
    I just did two lines of powdered wig powder, cranked up some Lee Greenwood, and recited the BoR. - Outlander Systems

    I'm a professional WAGer - WillBrink /// "Comey is a smarmy, self righteous mix of J. Edgar Hoover and a gay Lurch from the "Adams Family"." -Averageman

  10. #10
    Join Date
    May 2009
    Location
    NC
    Posts
    1,088
    Feedback Score
    4 (100%)
    Quote Originally Posted by Iraqgunz View Post
    I am glad it's working for you, but Loc-Tite is the wrong answer.

    IG could you please expand on this a little further. I agree that proper torque is the answer but it seems like loc-tite on something you don't want coming loose could only be additional insurance?

Page 1 of 2 12 LastLast

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
  •