Page 3 of 7 FirstFirst 12345 ... LastLast
Results 21 to 30 of 69

Thread: Loctite

  1. #21
    Join Date
    Dec 2010
    Posts
    453
    Feedback Score
    5 (100%)
    This is AR Technical discussion. Blanket statements such as "loctite will burn off" or "just buy a BCM" are worthless and add nothing to the conversation.

    Bill from Alexander Arms use(d?) Loctite 243. I find it interesting he decided to use a thread locker. Loctite 609 looks interesting, especially since its labeled as "Recommended for parts that will need subsequent dismantling, i.e., retention of bearings onto shafts and into housings." My guess is a retaining compound wasn't chosen as, obviously, we are using a barrel nut.

    I read somewhere else people use similar compounds on the barrel between the gas block. If anyone has any insight on this i'd love to hear about it.

  2. #22
    Join Date
    Oct 2012
    Posts
    4,275
    Feedback Score
    10 (92%)
    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?
    I don't believe you will see any improvement you can measure or repeat. .The potential for improvement is small compared to a reasonable margin of error.

  3. #23
    Join Date
    Oct 2012
    Location
    Texas
    Posts
    1,929
    Feedback Score
    45 (100%)
    Quote Originally Posted by BigLarge View Post
    This is AR Technical discussion. Blanket statements such as "loctite will burn off" or "just buy a BCM" are worthless and add nothing to the conversation.
    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.
    To educate a man in mind and not in morals is to educate a menace to society. --Theodore Roosevelt--

  4. #24
    Join Date
    Jun 2009
    Location
    Allentown, PA
    Posts
    3,389
    Feedback Score
    58 (100%)
    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.
    "Perfect Practice Makes Perfect"
    "There are 550 million firearms on this planet. That's one firearm for every 12 people. The question is... How do we arm the other 11?" Lord of War.
    "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

  5. #25
    Join Date
    May 2014
    Posts
    377
    Feedback Score
    0
    this is exactly the kind of input I am looking for.

    Personally I am an experimenter and this gun is an experiment.

    I know many on this forum are locked into the milspec mindset. Well I like to think outside the box. We are doing things with the AR's they were never designed for. how can milspec possibly work for that. I am looking for better than milspec.

    I built this one to play with. I really don't care if it works or not but I want to know.

  6. #26
    Join Date
    Oct 2012
    Location
    Texas
    Posts
    1,929
    Feedback Score
    45 (100%)
    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.
    To educate a man in mind and not in morals is to educate a menace to society. --Theodore Roosevelt--

  7. #27
    Join Date
    Oct 2012
    Posts
    4,275
    Feedback Score
    10 (92%)
    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.
    If the extension is a sweat fit into the receiver what is the loc-tite doing other than making things harder to take apart?

  8. #28
    Join Date
    Oct 2012
    Posts
    4,275
    Feedback Score
    10 (92%)
    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.
    I would like to hear just one person say.... I cannot prove it does anything but it makes me feel better to do it.

  9. #29
    Join Date
    Aug 2014
    Location
    Surrounded by pines in Wi.
    Posts
    155
    Feedback Score
    0
    Loktite on a barrel extension may change the harmonics on the barrel when fired...(whether it be for better or worse from with no Loktite).
    I guess we will see from your experiment.
    Also there is the new gun syndrome(sometimes we shoot better if we think we did something to improve the rifle).
    Multiple shots will tell.
    I did not use any Loktite on my BCM4 and Lija AR24 barrel cause it was very tight(tight enough that I do not think Loktite would have made any difference when it cured/dried to form any bedding to speak of.
    I did face the receiver .002" using the Brownells tool by hand cause I could put a .0015" feeler gauge from the 7-1 o'clock position and see daylight.
    Just took enough off the receiver face to have zero clearance and torqued barrel nut to 45ft.lbs.
    We will see in due time how she performs.
    Again, good luck with your experiment and let us know the true results.

    Clarence

  10. #30
    Join Date
    Jan 2013
    Location
    VA
    Posts
    2,268
    Feedback Score
    38 (100%)
    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.
    I cannot prove it does anything but it makes me feel better to do it

    I got one of the Larue barrels during the sale and I have an old LMT upper that is getting long in the tooth. The upper is in good shape and in spec. I always do my own builds except for precision builds (not that I am trying very hard with an old LMT upper) becuase my local smith, who is a friend, has always recommended lapping the receiver. He has the Brownells tool and he also asks (kind of recommends) adding locktite to the barrel extension.

    Someone posted a video in a thread not to long ago, which I have been trying to find since this thread came up with no luck that outlines the theory of how the loctite somewhat kills the side to side motion of the barrel. If someone finds it please post it, it was in regards to national match builds.

    Like lapping the receiver I don't see it hurting anything. It has been used by varmit hunters for a while now.

Page 3 of 7 FirstFirst 12345 ... 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
  •