Bolt On Free Float tube for AR-15

[abock33]

I came across this in a magazine and I was wondering if anyone has one?

Daniel Defense, Inc | Browse | Omega Rail | Omega Rail™ 7.0 (Carbine)

It's a bolt on free float tube that requires NO gunsmithing.

[DarrellM5]

I haven't seen that one, but I have the quad rail free float tube made by Troy. All it required was minor modification with a hack saw that even a novice can easily accomplish.

[FBMG Smithy]

It looks like an ok rail to me.