Regarding a torque wrench, you should never use a torque wrench to remove anything (affects torque wrench calibration and not a recommended best practice). Also, when installing a muzzle device, you typically "time" the replacement using a crush washer. I do, however, use a torque wrench on barrel installation, torqueing, loosening, re-torqueing, loosening and re-torqueing a third time, as per military specs. Besides the basics already mentioned, a good automatic (spring loaded) center punch (think Starrett, preferably the 18C) makes castle nut staking a breeze. I often also use the MOACKS gas key knurled set screws with the MOACKS staking tool to ensure proper gas key staking.
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