Is this a problem with carrier keys? Some bolts are spec'ed to be torqued with a lubricant applied to the threads, some are spec'ed to be torqued dry
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On carrier keys to ensure that they are sealing correctly here's how I do it:
Remove carrier key.
Discard old screws.
Degrease carrier and key.
Lap the bottom of the key on a course stone I have. This removes the finish from the bottom of the key and makes sure that the key is perfectly flat.
Clean off the key.
Apply a little Rocksett to the bottom of the key and set it on the cleaned off carrier.
Install new carrier key screws hand tight.
Torque each to 50-55in lbs (I torque the front one first).
Stake with a MOACKS, you don't have to use a MOACKs but it makes the job very easy and very fast.
If the staking caused large burrs to stick up above the key I dress then down a little with a stone/file.
I've never had a single one come lose nor leak using this method.
i cleaned the Y/M bolt carrier with brake cleaner -no damage to flat area ,where the gas key fits .got a new gas key from Y/M ,it came with two bolts and high temp red loctite . with info on how to-tighten to 35 inch pounds -red loclite put lightly on under side of the key as well on the threads ....well today i shot the weapon yes i have been working too long on other thing ---flawless working now ....