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Thread: Building an upper

  1. #21
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    The only way that you can shear and indexing pin, is if you overtorque the barrel nut, or a nut has seized and you try to break it loose. I have done probably a few hundred uppers using a Reaction Rod. The only time I sheared a pin was trying to correct someone else's mistake. They torqued the nut well over 80 ft./lbs. and they didn't use any anti-seize.



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  2. #22
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    I ordered the assembled upper and Botach reaction rod today.

  3. #23
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    Quote Originally Posted by ncshooter18 View Post
    I ordered the assembled upper and Botach reaction rod today.
    Good luck! If the Botach rod is anything like the Geissele rod, you're going to love it.
    “I predict future happiness for Americans, if they can prevent the government from wasting the labors of the people under the pretense of taking care of them.”
    Thomas Jefferson

  4. #24
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    I think the newer version of the reaction rod addresses any risks of shearing the pin, though as IG points out this is isn't really possible unless you go above 80 ft-lbs of torque. For a new builds using controlled torque values (such as the EMR) it's not an issue at all.

  5. #25
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    How to tell new RR from old?


    ---------------------


    Speaking of Anti-Seize ... what is the prep for a barrel.

    I have seen guys use nothing... or at least not mention they are using anything. Just slide barrel in and torque things down.

    I have seen guys use the copper anti-seize on thread only. Dry barrel.

    I have seen guys put Aero 33 on the threads, inside receiver, and barrel.

    I have seen guys put Aero 33 on outside of barrel only.

    What exactly is the proper way to lubricate, protect, etc.. the barrel and receiver threads?
    Last edited by tb-av; 11-03-15 at 17:45.

  6. #26
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    Quote Originally Posted by tb-av View Post
    How to tell new RR from old?


    ---------------------


    Speaking of Anti-Seize ... what is the prep for a barrel.

    I have seen guys use nothing... or at least not mention they are using anything. Just slide barrel in and torque things down.

    I have seen guys use the copper anti-seize on thread only. Dry barrel.

    I have seen guys put Aero 33 on the threads, inside receiver, and barrel.

    I have seen guys put Aero 33 on outside of barrel only.

    What exactly is the proper way to lubricate, protect, etc.. the barrel and receiver threads?
    The "new" Reaction Rod is known as the Super Reaction Rod and it has two brass wedges that fit through the ejection port that stop the upper from being able to rotate against the index pin. The brass wedges also preload the barrel extension lugs against the lugs of the Reaction Rod in the direction of torque you choose (loosening or tightening).

    The brass wedges make it an absolute bitch to install a barrel with the torque three times to 30 foot pounds barrel installation method as found in the tech manuals, because before you change the direction of torque you have to readjust the brass wedges every time you do so.

    As for lubing the threads AeroShell 33MS meets the spec, you put it on the threads of the upper receiver, on the threads of the barrel nut and the outside surface (side facing the FSB) of the barrel extension flange. Iraqgunz uses Loctite C5-A but that contains graphite and is considered a no-go by most guys on the forums, I used to use Brownells Barrel Assembly Paste which contains 65% moly but this was discontinued, now I use T S Moly TS-70 moly paste which contains 70% moly.
    Last edited by 556Cliff; 11-04-15 at 16:47.

  7. #27
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    10-4, thanks,

    Do you guys think that BEV block would be a good option for the casual but careful builder, no volume. IOW, you get a similar upper deal and a lower block as well... but that upper part of the BEV I wonder if it has any issues to be concerned about?

  8. #28
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    Quote Originally Posted by tb-av View Post
    10-4, thanks,

    Do you guys think that BEV block would be a good option for the casual but careful builder, no volume. IOW, you get a similar upper deal and a lower block as well... but that upper part of the BEV I wonder if it has any issues to be concerned about?
    I think the BEV Block would be okay for your use, it is likely better than the standard Reaction Rod since it has built in stops that would prevent the upper receiver from shearing the index pin.

    Or you could just wait for this awesome barreling jig like I have been. http://www.ar15.com/forums/t_2_489/2...mbly_jig_.html
    Last edited by 556Cliff; 11-03-15 at 18:41.

  9. #29
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    ^ I haven't broken any indexing pins yet with mine. Then again some people could be over torquing their parts...

  10. #30
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    I doubt most of the guys on the forums have built as many guns as I have. I have been using C5-A for well over 10 years, and on my personal guns.

    Quote Originally Posted by 556Cliff View Post
    The "new" Reaction Rod is known as the Super Reaction Rod and it has two brass wedges that fit through the ejection port that stop the upper from being able to rotate against the index pin. The brass wedges also preload the barrel extension lugs against the lugs of the Reaction Rod in the direction of torque you choose (loosening or tightening).

    The brass wedges make it an absolute bitch to install a barrel with the torque three times to 30 foot pounds barrel installation method as found in the tech manuals, because before you change the direction of torque you have to readjust the brass wedges every time you do so.

    As for lubing the threads AeroShell 33MS meets the spec, you put it on the threads of the upper receiver, on the threads of the barrel nut and the outside surface (side facing the FSB) of the barrel extension. Iraqgunz uses loctite C5-A but that contains graphite and is considered a no-go by most guys on the forums, I used to use Brownells Barrel Assembly Paste which contains 65% moly but this was discontinued, now I use T S Moly TS-70 moly paste which contains 70% moly.



    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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