Which is the same order of magnitude as 40 ft lbs.
You just need to tighten this snuggly and stake it.
I wouldn't go past 20 ft lbs.
To many buffer tubes and barrel nuts are ruined by having some gorilla on these parts.
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I know what Colt recommends.
You are torquing steel threads against aluminum threads. The threads are taking the most violent load. The end plate and end of the castle nut is taking a less substantial compression load.
The reason for my position is I don't buy into the line that "only a little effort on the wrench" and you can undo a factory carbine stock.
Over half of the stocks I work on need to have the staking and/or castle nut cut away to avoid striping out the keyway on the buffer tube which turns a five minute project into a $100 project.
How much Moly do they recomend on the threads?
40 ft. lbs. on an motor vehicle alloy wheel? I don't think so! Torque your wheels & weapons properly so you won't have any problems. Torque is specified for a reason, not just so someone can dismiss it's purpose or usefulness.