What to do when the barrel nut is either too loose or too tight?

[Irving]

Wow, great info. Learned something new today.

[BPTactical]

For future reference Spikes makes barrel nut shims to time a pesky nut. They are really handy for nuts that are proprietary. For standard nuts if I get one that won't time in a decent torque range I use a different nut.
Ray is on the money for wrenches, as long as they are not mis used they keep an accurate torque for a long time.
Always back the wrench off to its lowest possible setting before storing it.

[Great-Kazoo]

For future reference Spikes makes barrel nut shims to time a pesky nut. They are really handy for nuts that are proprietary. For standard nuts if I get one that won't time in a decent torque range I use a different nut.
Ray is on the money for wrenches, as long as they are not mis used they keep an accurate torque for a long time.
Always back the wrench off to its lowest possible setting before storing it.

AND put some lube NOT Loctite on the receiver threads.

[Tim K]

For future reference Spikes makes barrel nut shims to time a pesky nut. They are really handy for nuts that are proprietary. For standard nuts if I get one that won't time in a decent torque range I use a different nut.
Ray is on the money for wrenches, as long as they are not mis used they keep an accurate torque for a long time.
Always back the wrench off to its lowest possible setting before storing it.

More great advice. Thanks.

[Tim K]

The linked tool worked perfectly, and very quickly. I put a little lapping compound on the surface and ran the drill for 5 or 6 seconds at a shot. It took 3 treatments to get it right, but it's perfect. It took far longer to try the fit after each treatment than it did to actually do the work.

Highly recommended.