It takes a special wrench.
I made my own.

Also, they are all loctited together.
It's a fun project.

I don't know how tough the "Baer Coating" is...

Here's my wrench:



It works much like a YHM wrench, but it has the appropriate sized pin to engage the hole in the lock-ring on your handguard.
It only contacts the lock-ring.

The hard part about the loctite was getting the handguard tube off the barrel nut.
I had to put two vertical fore-grips on two opposing rails to twist it off AFTER the lockring was loosened.