Remington 7600 barrel nut removal?

[padan66]

Has anyone ever removed the barrel nut off a Remington 7600 pump rifle, or know how too? (Not the 760 model)If so, could you explain how it is done?
I'm sure a special wrench is needed, but are the barrel threads left, or right handed and are the barrel nut and lug one, or two separate pieces?
Please see picture below.
Thanks.

[Ridge Runner]

I think the barrel screws out of the barrel block, not positive but I think it does
RR