Q: I can’t get my barrel nut to align. Any advice?
A: First we want to make sure you are using the correct fixtures to support your upper in a vise so you don’t damage the upper. Are you using a clamshell fixture or other quality way to hold the upper receiver without damaging it? If so we removing the barrel nut and cleaning/degreasing the barrel nut threads. Wipe some new grease on the threads and the front of the barrel extension collar where the barrel nut pulls. Install the barrel nut by hand and tighten/loosen it 3-5 times with the barrel nut wrench.
Then loosen the barrel nut, set the torque wrench to 30 ft/lbs, and torque the barrel nut.
If it doesn’t line up loosen it, set the wrench to 40 ft/lbs and torque the barrel nut.
If it doesn’t line up loosen it, set the wrench to 50 ft/lbs and torque the barrel nut.
If it doesn’t line up loosen it, set the wrench to 60 ft/lbs and torque the barrel nut.
If it doesn’t line up loosen it, set the wrench to 70 ft/lbs and torque the barrel nut.
If it doesn’t line up loosen it, set the wrench to 80 ft/lbs and torque the barrel nut.