Sometimes the manufacturers wont give you the information you want. In this case they did.
Apparently Permatex Aviation is the industry standard.
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Double post
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I was being a smart aleck.
IE: "The internet is for misinformation and lies, not actual facts"
Go Ukraine! Piss on the Russian dead.
LMT uses something from Loctite, I believe it's gasket sealant 518. I have a little bottle of it for gas keys, but I prefer to use nothing.
518 is what I use. I bought it last time I did some research on it. I doubt using it or not matters, but OCD. One tube will probably last a lifetime for me. I generally avoid effing with gas keys.
yea thats why I buy LMT stuff. This was from circa 2013 or so I guess. Gun ran fine suppressed, but un-suppressed it was erratic. I originally placed blame on running an H2 buffer(shared lower with 9" 300blk upper) and it being a 10.5", then I found the gas key was loose. I had emailed LMT a few times back in 2014 or so when I first realized the key was loose to attempt to warranty it. Never got a response to fix it under warranty and it wasnt a huge deal to me. Life changed and I wasnt able to shoot near as much so a lot of stuff moved the back burner. Recently built another SBR lower so this upper was going back into the rotation so I needed to change the gas key. Staking broke free easily enough(it LOOKED good) and I saw no evidence the screws had actually moved in the staking. Went back on with a BCM gas key and some OCKS screws. Gun functions 100% now.
Long story short, at least in 2012-2013 time frame LMT did NOT use any kind of sealant under the gas key. Standard M16 carrier.
The take-away for me is; we have the formula for doing the job right. If you're doing a field repair and don't have the right sealant, I get it. But if I'm at my bench I'm going to stick to the proper standard.
Lap the key, ensure both surfaces are clean, apply the Permatex, the OCKS screws, and 58 in lbs of torque. Then stake the carrier key using a MOACKS.
Note; Lightly dipping a straw into the Permatex container and then carefully placing the straw over the gas port hole of the carrier makes a neat circle around the the gas port hole.
After that I run a pipe cleaner through the gas key to remove any excess that may have gotten into the gas pathway.
Last edited by prepare; 04-21-21 at 05:57.
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