Results 46 to 55 of 55
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24 July 2015, 14:57 #46
DON'T USE LOCTITE ON GAS BLOCK SET SCREWS. Sorry to yell but some folks aren't listening. That shit melts at a pretty low temperature. Use Rocksett or another ceramic-based high-temperature adhesive. It's water-soluble and it's no harder to remove than Loctite, but it won't melt!
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24 July 2015, 15:22 #47
Not contradicting anyone or saying what any of you do/recommend is right or wrong, but BCM uses high temp red loctite on their gas block set screws.
The thing about high temp permanent red is that even after it goes above the rated temp, it's still a real pain in the butt to remove.Will - Owner of Arisaka LLC - http://www.arisakadefense.com
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24 July 2015, 15:45 #48
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24 July 2015, 20:35 #49
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24 July 2015, 20:47 #50
Can use the purple or even the red loctite - just a very tiny drop for the set screws. It all has to do with whether you think that there is a possibility after a couple hundred rounds that you will decide to change the gas block. How many thousands of rounds will get shot through the barrel before the barrel needs changing?...
As with everything with AR's, planned usage dictates how a rifle needs to be built for it to reliably perform it's intended function.
For me, it will take me probably around 10 years to put 5000 rounds through a barrel. I do have other rifles and I have shotguns. If a gas block will hold up for 5000 rounds, why would I spend extra to pin it?Freedom is NEVER Free. We have to work to protect it and even be willing to die to protect it.
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24 July 2015, 20:51 #51
Will,
You plan to have 5k through one gun. I have 5k already though multiple guns. They all have FSB's or pinned gas blocks. You're right, usage dictates... but 5k rounds in 10 years is a very light shooting schedule, and frankly nowhere on the hard use radar. For you, yeah, you probably won't notice the difference as you average 41 rounds per month. For me, $30 to pin a gas block is money well spent.
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24 July 2015, 20:56 #52
Yea I'm not even close to UW as far as shooting regularity but I shoot about 2-3 times a months an shoot a minimum of 2-300 rounds per session. Slippers can tell you I bring enough to appease us x3 for every gun I bring, which is usually all of them. (Thank God I haven't been pulled..) He does the same I might add.
$30 in a the scheme of things isn't much more than a box of ammo...
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25 July 2015, 04:10 #53
It's not the vibrations from shooting that loosens the set screws but the expansion and contraction during the heat cycles. No thread locking compound can prevent that type of fastener stress from causing the block to shift.
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25 July 2015, 14:31 #54
It seems the issue has already been addressed but obviously the pin is the most reliable. I personally pin all of mine and offer the service at the shop as Hmac mentioned. I've seen several gas blocks that were dimpled, even loctited, come loose at classes and matches. In addition to pinning, if customer requests we often use rocksett as well. Rocksett is easy to remove along with the pin if you ever need to remove the gas block or barrel nut. Also FWIW, I know some armorers that have used sleeving compound to seal and lock gas blocks. I can say that is very difficult to remove and requires significant heat. Melonite treated blocks and barrels are no issues to dimple or pin, just have to have the right bits.
Thanks for the compliment Hmac, always nice to hear that folks are happy with the work.
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9 August 2015, 23:52 #55
My gas block just came loose (a little wiggle) after its second outing. I cleaned the threads, applied more Rocksett, and added more torque, I think 20"/#. We'll see how long that lasts. If it poops again, I'll replace it with an SLR adjustable, and get it pinned.