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Thread: Barrell install with locktite?

  1. #1
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    Barrell install with locktite?

    I saw a barrel install video on utube. The man used blue locktite to take up the free space between upper case and the barrel before installing the nut. He brushed it around the end of the barrel. Is this normal practice? I understand what he is trying to accomplish, weather it helps or not is questionable. Any armors recommend this?

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    Quote Originally Posted by C4vettrn View Post
    I saw a barrel install video on utube. The man used blue locktite to take up the free space between upper case and the barrel before installing the nut. He brushed it around the end of the barrel. Is this normal practice? I understand what he is trying to accomplish, weather it helps or not is questionable. Any armors recommend this?

    Even if the blue locktite secured the fit between the barrel and upper, it wouldn't do anything once the weapon is running and heating up. The AR is not a bolt action that needs to be bedded. But if you do something like that, might as well use rocksett or something extremely heat resistant.

    It's not needed at all. In fact the specs call for moly grease between the barrel nut, barrel and upper receiver. I have used plain lithium grease in the past. It is recommended to stay away from greases that include graphite because of a risk of corrosion.
    Last edited by amd5007; 03-29-13 at 12:34.
    Quote Originally Posted by RichDC2 View Post
    That rifle has won trophies for its game face alone!

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    I've heard of this. I just put a touch of moly there, and of course do the threads.

    I've had some stubborn upper/barrel extension mate ups. I think Grouchy Robb Jenson has used a similar technique on precision builds. I could be wrong though..
    "You people have too much time on your hands." - scottryan

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    For a precision build some guys will use Loctite, but blue isn't what I would pick. There are Loctite version, 609 IIRC, that is specifically made and sold to be a sleeve retainer. Its what I would use.

    If you are spending extra money with the intention of shooting as small of a group as you can, I think it may be worth it. However, if your upper and barrel extension are on opposite sides of the tolerance range, you should deal with that first.

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    Quote Originally Posted by bp7178 View Post
    However, if your upper and barrel extension are on opposite sides of the tolerance range, you should deal with that first.
    Yeah... I've had some really loose fits... and on the other end of the spectrum, I had to beat a 300 BLK barrel into the upper far enough to the the nut to grab.. And tighten it the rest of the way.

    I hope that guy never wants to rebarrel that upper.
    "You people have too much time on your hands." - scottryan

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    For the guys who are really torqued off at dropping "X's" at Camp Perry, taking out the slop might be worth it.

    Then again, for the cost of a build that will do credit to an NRA High Power High Master, you can afford to mix-and-match uppers and barrel extensions until you get a press-fit.

    For the rest of us, it is extra work for no perceivable benefit.Unless you like extra work when it comes time to re-barrel.

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    This has been discussed before: https://www.m4carbine.net/showthread.php?t=119904

    3 pages worth. Based on that thread I bought 243, as recommended by Alexander Arms, although it sounds like 609 would work as well.

    Mark

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    I don't get where the extra work comes in. There is this perception that anything with loctite is somehow embedded in stone and requires hundreds of hours of labor to remove.

    Take a heat gun and warm the part. When the oil has evaporated off and the part looks really dry, the loctite has broken down and the parts will slide apart. This maybe takes 5 minutes.

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    Back in the day it was one of those "accurizing" tricks for High Power, but not necessary with today's quality components. I'll go further to say that if you are trying to build a sub-minute gun, the parts needed ought to fit right for how much you paid for them.

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    Quote Originally Posted by markm View Post
    Yeah... I've had some really loose fits... and on the other end of the spectrum, I had to beat a 300 BLK barrel into the upper far enough to the the nut to grab.. And tighten it the rest of the way.

    I hope that guy never wants to rebarrel that upper.
    That Noveske 8.2" ain't ever coming off Mark!
    "Every step we take towards making the State our Caretaker of our lives, by that much we move toward making the State our Master." Dwight D. Eisenhower

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