[Carriercomp "Muted" Titanium tube]

Has anyone purchased one of these, and how does it compare to the H20 cerakote finish? I've placed an order for one but I'm debating whether I should go with an NP3 coated steel tube from FFT instead. Any input is appreciated.

[M4 Bead sight/Fiber optic]

I have an M4 waiting for me at my LGS. I'm most familiar with beads on shotguns and was wondering if it's possible to remove the ghost ring and install a fiber optic front post or bead. Can't find anything online. 

I haven't actually handled it yet so I may end up liking the ghost rings. Just curious if anyone has tried this.