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Thread: Loctite

  1. #31
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    Quote Originally Posted by TXBK View Post
    There isn't anything milspec about receivers milled for tight fit with barrel extension, checking receivers for squareness and trueness, hitting specific barrel nut torque values, shimming muzzle devices, squaring barrels to the bore line, fitted bolts, attention to the barrel crown. Along with hand loading ammunition, these are things that improve accuracy. I do not believe in using Loctite on a barrel extension, as a way to improve accuracy.
    Actually there are quite a few precision upper builders doing it. Do a little google search.

    done all of that except for muzzle devices. don't use them on my precision barrels. You really don't have much control over how tight the fit between receiver and barrel extension will be. I have have used high priced billet uppers, Vltor mur, DPMS some are tighter than others.

    I guess we will find out. I have tried a lot of things. Some work better than others.

    If you want to see how the gun groups prior to gluing the barrel in I am number 3 in the MOA challenge in the Precision Rifle Simi Automatic on this forum. That is pretty representative of the average group for this rifle. Sure I have shot better but this is 5 5 shot groups. This Saturday I will shoot the same load and bullet again. We will see what the change is if any. I really have no expectations. I have tried so many different things. Some worked better than others.

  2. #32
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    Personally, I would not want to do something that would not be done at the factory...as far as lock tight on a barrel.
    Good night Chesty...wherever you are.

  3. #33
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    Quote Originally Posted by rcoodyar15 View Post
    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?
    Enjoy it while you can......my 20" WOA upper is almost finished......and I ordered a new scope!!!!

    Quote Originally Posted by GH41 View Post
    I would like to hear just one person say.... I cannot prove it does anything but it makes me feel better to do it.
    Posts like this are so refreshing in here.......conjecture seems to be a prerequisite in the Tech section.

  4. #34
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    Quote Originally Posted by rcoodyar15 View Post
    Actually there are quite a few precision upper builders doing it. Do a little google search.
    I do not believe in using Loctite on a barrel extension, as a way to improve accuracy.

    done all of that except for muzzle devices. don't use them on my precision barrels. You really don't have much control over how tight the fit between receiver and barrel extension will be. I have have used high priced billet uppers, Vltor mur, DPMS some are tighter than others.
    There are companies that will fulfill a customer's desire to get a tight fitting, square, and true upper receiver. They could probably make sure your barrel fit exactly how you want it to.

    I guess we will find out. I have tried a lot of things. Some work better than others.

    If you want to see how the gun groups prior to gluing the barrel in I am number 3 in the MOA challenge in the Precision Rifle Simi Automatic on this forum. That is pretty representative of the average group for this rifle. Sure I have shot better but this is 5 5 shot groups. This Saturday I will shoot the same load and bullet again. We will see what the change is if any. I really have no expectations. I have tried so many different things. Some worked better than others.
    Unless you do some testing, like Molon, which would break the rules of that "competition", you will never know the potential of your rifle...only the potential of the rifle in your hands. An awful shooter can make a fine rifle look bad. That is not a dig at you, but in the name of scientific experimentation, you would need to remove as many variable as possible to verify exactly how much of a difference the Loctite made in regards to the accuracy of your rifle.
    To educate a man in mind and not in morals is to educate a menace to society. --Theodore Roosevelt--

  5. #35
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    TXBK, did you read the thread I posted above?

  6. #36
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    Quote Originally Posted by themonk View Post
    TXBK, did you read the thread I posted above?
    Yes sir, but I still don't believe in using Loctite as a way to improve accuracy. It seems to me that Loctite may be used by some to make up for the quality and specs, or lack there of, of the components being used. Seriously, what improvements are expected by using Loctite on the barrel extension of an AR-15? I understand that benchrest shooters can be a kooky bunch, with some of their methods, because I work with one.
    To educate a man in mind and not in morals is to educate a menace to society. --Theodore Roosevelt--

  7. #37
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    Good information in here for sure, and I think at the end of the day, we have established that there is no empirical data to support either side of the discussion. One thing I read though however, is the notion of using loctite on upper receiver threads when installing a BN. I'm no armorer, but I've assembled enough AR's and read enough about the topic to know this is probably the worst advice anyone can give.



    Quote Originally Posted by CoryCop25 View Post
    I use blue locktite.
    My long range rifle has a Precision Firearms billet upper that I had to heat to get the barrel extension in. I put a very light coating of locktite on the barrel extension and inserted the barrel. I then used a drop on the threads because I only used about 40 ft/lbs of torque on the barrel nut.
    This particular rifle will never get to 300 degrees when it is fired and I won't be tearing it down nearly as much as my hard use rifles.

  8. #38
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    Quote Originally Posted by Toecheese View Post
    Good information in here for sure, and I think at the end of the day, we have established that there is no empirical data to support either side of the discussion. One thing I read though however, is the notion of using loctite on upper receiver threads when installing a BN. I'm no armorer, but I've assembled enough AR's and read enough about the topic to know this is probably the worst advice anyone can give.
    Don't tell anyone at KAC...

  9. #39
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    Quote Originally Posted by bp7178 View Post
    Don't tell anyone at KAC...
    Well that settles it....BCM, Noveske, Adco, Rainier Arms don't according to my research. Besides making removal a PITA, what is the point exactly? In fact I read that Adco (one of the most respected armorers in the industry) has openly criticized using loctite. But I'm probably wrong, and soon there will be responses recommending cement or concrete on my weapon system to improve accuracy.

  10. #40
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    Quote Originally Posted by TXBK View Post
    Technically speaking, using a receiver that has a tight barrel extension fit and has been checked to be square and true will produce more, positive results, than applying a substance to the barrel extension that does not belong there. The BCM4 was merely used as an example, because it is specifically designed for this purpose. Technically speaking, of course.
    I don't think anyone is debating that quality components are more important than the assembly process.

    This is a quote I found on the grendel forums and, supposedly, Bill Alexander states "It has been found that the harmonics of the Grendel can cause vertical stringing. So to lock this down without LockTite you are talking over 70foot-pounds of torque on the barrel nut. That can be hard on the receivers. As a solution that seems to work quite well was to bed the barrel and gas block in the LockTite 2440 (replaced with 243) and torque to normal specs."
    http://www.65grendel.com/forum/showt...g-for-accuracy
    Take that for what it is worth, as I do not have the direct link to quote where he says this.

    Also, i've found that JP rifles recommends coating the barrel with Loctite 609 when installing their adjustable gas block.
    Last edited by BigLarge; 08-11-15 at 02:24.

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