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What sort of torque do you use?
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You mean how many ftlbs? I'd go by whatever Aero recommends--keep in mind you're not going to need anything up in the super-torque range (in the old days of delta ring barrel nut assembly "rule of thumb" was 65 lbs+) because you won't need to align nut to get the gas tube to clear the gas tube opening in the receiver.
When I say tight fit--I don't mean high torque of the barrel nut--I mean a tight fit of the extension into the receiver.
Scratch that--I just found it--they say 55 ftlbs so I'd go with that. Mine might be a bit less--it's been years since I did them.