Quoted: torque wrenches aren't necessary if you have good understanding of tight and not tight enough.
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Damp spaghetti noodle limp torque = Not tight enough
Tighten till your elbow is smoking, then back it off an 8th turn = Tight enough
TM 9-1005-319-10
Apply molybdenum disulfide grease to the threads before installation.
Using combination wrench (10) and torque wrench, torque barrel nut assembly (9) to 30 ft-lb (40.5 N-m).
Torque is measured when both wrenches are used together.
Three times torquing procedure provides for a better thread fit and prevents barrel nuts from becoming loose.
Do not torque over 80 ft-lb (108 N-m) while tightening the barrel nut assembly to the next hole, to allow for proper alignment of gas tube.
12. Torque the barrel nut assembly again to 30 ft-lb (40.5 N-m) while maintaining sight alignment.
The barrel nut assembly may be tightened beyond 30 ft-lb (40.5 N-m) to align the barrel nut assembly serrations for proper gas tube clearance.
Never loosen the barrel nut assembly to align for gas tube clearance.