AR15.Com Archives
 Gas block and loctite questions
gearjammer5  [Member]
6/22/2009 8:11:57 AM EST
I am installing a YHM9383 lo pro gas block on a SPR barrel. After positioning the block I dimpled under the set screws to keep it from shifting.
Do I still need to loctite it as YHM instructs? If so is there a common substitute for loctite620 or should I just pony up the 19 bucks and order it from Midway? Last, will this stuff stick to the barrel's ceracoat or should I dremel down the area that is being sealed? Thanks
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hdbiker1  [Member]
6/22/2009 8:48:35 AM EST
I've only done afew gasblocks and have never used loctite. As a matter of fact, I've never dimpled (bear catted) the set screws. To date I've only had one loosen up. If you have good quality gasblocks, ie. the bores are correctly sized and uniform, I don't see a problem of sealing. It will seal eventually (if leakage occurs) with carbon. Of course, that's me. I'll never take my guns into battle, my time has been served. But if it makes you feel better, do it.
sd_norske  [Team Member]
6/22/2009 10:07:40 AM EST
You want to use red Loctite on the set screws. Don't put it between the barrel and the gas block. You should be able to find it at a hardware store of less than $19.
HotDiggity  [Member]
6/22/2009 1:19:09 PM EST
I've always used blue loctite on my gasblock set screws and have never had an issue. I tend to keep away from the red variety myself.
STJ  [Member]
6/22/2009 2:34:47 PM EST
Loctite is useless for use on a gas block, it breaks down at 400 degF and starts to weaken at 250......Getting over 400 degF is easy to do with sustained fire. Use Rockset.
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