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Thanks, I’ll check with my local welding supplier. I have a large 6000 psi nitrogen cylinder but would like something more portable.

Where did you get that nitrogen cylinder? Is it steel?

You should not need to. The AOA adapter should thread onto the barrel inside the barrel shroud, then screw the Fatboy onto the end of the AOA adapter.

If the stock adapter and moderator thread off the barrel, you should be all set to install aftermarket adapter and your moderator.

The adapter is treaded onto the end of the barrel and threaded into the original moderator. If you have the aftermarket adapter, it will thread onto barrel inside barrel shroud. Thread you moderator onto the end.

I wrapped the jaws of a pair of Channel Locks in electrical tape and it unscrewed, no issues or marks.

About 5” plus 2” for the adapter.