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Thread: Loctite

  1. #11
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    Quote Originally Posted by bp7178 View Post
    What makes you think you wouldn't be able to take them apart?

    Applying a heat gun to the parts will make them easily removable. There is no permanent loctite.

    That being said, red loctite isn't what I would use, but rather the sleeve retaining versions which are typically green. I think its 607. Its not going to make a 3 MOA gun a 1/2 MOA one. But, you might make your 3/4 MOA rifle more consistent across different tempratures or take that 3/4 MOA and maybe make it a 5/8 MOA.

    If its not a rifle I'm going to shoot for groups, I wouldn't bother.
    So just for clarification, you are stating that using loctite will help improve accuracy from 3/4 MOA to 5/8? And this is based on what exactly?

  2. #12
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    Quote Originally Posted by Toecheese View Post
    So just for clarification, you are stating that using loctite will help improve accuracy from 3/4 MOA to 5/8? And this is based on what exactly?
    really I have been reading a lot about it. Looks like a lot of the precision upper builders are doing it.

    Well since I am third in the MOA thread and I did it to my gun today we will see if it can take a 3/4 MOA gun and make it better. Same ammo next weekend with a glued barrel.

    Looks like a good experiment.

  3. #13
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    Quote Originally Posted by rcoodyar15 View Post
    really I have been reading a lot about it. Looks like a lot of the precision upper builders are doing it.

    Well since I am third in the MOA thread and I did it to my gun today we will see if it can take a 3/4 MOA gun and make it better. Same ammo next weekend with a glued barrel.

    Looks like a good experiment.
    Same here when I get my 20" WOA put back together.......I just need to find an upper!

  4. #14
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    Quote Originally Posted by Toecheese View Post
    So just for clarification, you are stating that using loctite will help improve accuracy from 3/4 MOA to 5/8? And this is based on what exactly?
    I would first direct you to my use of the word maybe...which wasn't an accident.

    I have noticed that in the last two uppers I've put together when I bedded things that they were more consistent. Not necessarily more accurate, but across all recorded groups there was less deviation. A dropping of "flyers" as it were.

  5. #15
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    I think that using a quality, tight-fitting upper receiver, such as the BCM4, would do more good than using Loctite.
    To educate a man in mind and not in morals is to educate a menace to society. --Theodore Roosevelt--

  6. #16
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    Quote Originally Posted by TXBK View Post
    I think that using a quality, tight-fitting upper receiver, such as the BCM4, would do more good than using Loctite.
    Don't get me wrong. I completely agree that a tight fitting upper is the most ideal solution. Not wanting to completely jerk BCM off, they only have a say in half of the equation. The barrel extension also has an effect here. So unless you are in a position to test fit many different parts to find the most ideal fit, bedding is just a tool to have in your back pocket should you find that your purchased parts aren't quite ideal.

  7. #17
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    Quote Originally Posted by bp7178 View Post
    What makes you think you wouldn't be able to take them apart?

    Applying a heat gun to the parts will make them easily removable. There is no permanent loctite.

    That being said, red loctite isn't what I would use, but rather the sleeve retaining versions which are typically green. I think its 607. Its not going to make a 3 MOA gun a 1/2 MOA one. But, you might make your 3/4 MOA rifle more consistent across different tempratures or take that 3/4 MOA and maybe make it a 5/8 MOA.

    If its not a rifle I'm going to shoot for groups, I wouldn't bother.
    Permatex 640 is good to 400F - Mil-R-46082B Type II - static sheer at 300F - 1500psi

    Loctite 609 is good to 300F - Mil-R-46082B Type I - static sheer at 300F - 1000psi

    Both met Mil-R-46082B which requires -65 to 300F temp range.

    The normal clearance filling ability of the retaining compounds is as follows: Type I -.004 inch, (,0.102mm) Type II -.008 inch (0.203mm). For optimum strength and cure, the clearance should not exceed .002 inch (0.058mm). (From the Mil-Spec)

  8. #18
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    Quote Originally Posted by 26 Inf View Post
    Permatex 640 is good to 400F - Mil-R-46082B Type II - static sheer at 300F - 1500psi

    Loctite 609 is good to 300F - Mil-R-46082B Type I - static sheer at 300F - 1000psi

    Both met Mil-R-46082B which requires -65 to 300F temp range.

    The normal clearance filling ability of the retaining compounds is as follows: Type I -.004 inch, (,0.102mm) Type II -.008 inch (0.203mm). For optimum strength and cure, the clearance should not exceed .002 inch (0.058mm). (From the Mil-Spec)
    Diameter of the hole in the upper: 1.000" +.002"

    Diameter of barrel extension: .9987" -.0008"

    Clearance: between .0013" and .0041"

    Should be good enough to hold fairly well.....especially since you really don't care if you get maximum strength.

  9. #19
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    Quote Originally Posted by lysander View Post
    Diameter of the hole in the upper: 1.000" +.002"

    Diameter of barrel extension: .9987" -.0008"

    Clearance: between .0013" and .0041"

    Should be good enough to hold fairly well.....especially since you really don't care if you get maximum strength.
    Thanks for that info - I think I'll give it a try.

  10. #20
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    yep

    I Disassembled my upper. degreased the barrel extension and inside of the receiver with brake cleaner. put a nice coat of red 271 Loctite on the receiver extension. Slid her home and cleaned up my overruns. screwed on the barrel nut to 35# of torque. took the assembly off the reaction rod and with qtips cleaned up the excess on the inside of the receiver/barrel extension. got it standing in a corner with the receiver up. Will let it dry till Friday.

    last weekend I shot the MOA challenge before gluing in the barrel. That is pretty much what this gun averages. I am in third place. This Saturday I will use the same bullet and load and shoot the challenge again. We will see if there is any improvement.

    Who believes there will be improvement? not?

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