Quoted:
The omega on my dd m4v1 doesn't have the part where the plastic handguards slip into. I can't remember the name of the parts.
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The BCM Upper (
this one?) has the Delta assembly on it. The regular Omega will attach to it without any modification.
The DD rifle you have (
this one?) has an Omega X rail that uses a proprietary nut and no Delta assembly.
So when you go to buy the Omega, buy the regular Omega 9" for the BCM, not the Omega X. The Omega X will require you to remove the pinned muzzle device and FSB in order to change the standard nut to a DD nut.
I have a DD Omega 7" and think it is the best FF system out there that does not require any modifications. I also like the DD EZ (not sure if it comes in mid) for a nice, inexpensive non FF drop in.
(Edited for missing letters in words.)