G&G M4 Floating Handguard Barrel Nut
 

Ok guys, so I have a G&G M4 with a floating handguard. I'd like to change the outerbarrel, and do a few other changes to it, BUT: I cannot for the life of me figure out how to remove the barrel nut.
The style I have is shown here in this exploded diagram from G&G:
http://www.guay2.com/web/drawings/16/CRW_explode.pdf
the sub-diagram CRW-03 shows the section I am talking about.
Now, my problem. I can see that there is a threaded pin that acts as the 'gas tube', but two pins that APPEAR to push in to each side.
I cannot seem to remove those two side pins to begin the process. Nor, do I know if I even HAVE to to begin the procedure.
If anyone has experience with this I would LOVE a hand.
Thanks in advance!

edit: Even if someone knows what this style of barrel nut/delta ring is CALLED, so I can research it, even that would be more than enough help to get me started. I'm simply at a loss on how to begin.

The pins on the gas tube can be pressed out. Just make sure no set screws are holding them as well.

The delta ring needs a delta ring wrench.

You're thinking of a barrel nut spanner. I have one of those, and that's not the issue. Take a look at the diagram and you will understand.

My cqd has the same arrangement. To pull the nut off, loosen the outer nut & take rail off. Take a screw driver and pull out the gas tube screw. Should have a slot in it. It's threaded to barrel nut iirc. Once out put the rail back on with those floating pins & unscrew the entire assembly from the upper receiver.

So the outer nut should just unscrew freely as it is? That's the first step?
If so, what direction does it thread off, because I tried that, and got no result. Admittedly I didn't try very HARD because I didn't want to risk breaking anything if I was doing it wrong....

Outer barrel nut will thread off standard ccw with the nut spinning towards the upper receiver. It's captured between upper & barrel nut

Hold rails on one hand & outer nut in other hand and twist lefty loosie