VFC HK416c, need help

[Pazuzu]

Hello all,

I cannot seem to figure out how to remove the stock from this gun.
I loosened the castle nut and removed the skeletal stock, but there is no way that I can see to remove the "tube" as it is not hollow like a standard buffer tube, so there is no screw to access.

Anyone know?
Thanks in advance.

[Pazuzu]

So it turns out that there is a very well hidden plate at the very back of the 416c stock that screws off. It is the one with the little spring button. Mine had such tight tolerance that it looked like a solid piece. Only when I put a rubber oil filter wrench on it that I saw it move while the rest of the "Tube" stayed in place.