Has anyone successfully installed a Omega X on an N4?
Here is the story:
I purchased a DD complete upper (16" mid LW) with an 12" Omega X. Instead of using the DD upper on any old lower, I decided I would get a matched upper/lower from Noveske. I successfully installed the barrel to the Noveske upper (tightened barrel nut to 50lbs) and the rail to the barreled upper. I could not get the upper to mate with the lower. There is interference from the N4 lower with the lower portion of the rail. There seems to be extra material on the N4 lower that is not on any of my other lowers (examined 2 CMMG and 2 Stags for comparison). My buddy has 2 of the N4 matched upper/lower sets and his are identical to mine. I am pretty sure I did not get a defect.
To double check this I loosened the rail completely from the barrel nut, then attached the upper to the lower and re-installed the rail. When trying it this way I could not get the rail mounted square. It is slightly angled upwards. When laying a level over the upper and the rail you see a slight V and a gap of about 3/32" between the level and the low point. When trying to to pivot the upper by the pivot pin there is considerable interference between the bottom portion of the rail. It is so tight I did not want to force it and risk damage to the lower or rail.
What am I doing wrong? Is the N4 lower incompatible with the Omega X?
Other things to note:
- At 50lbs of pressure the barrel nut is in such a position that the setscrews for the Omega X are going in side the indents on the barrel nut. I know this is not ideal. Should I tighten more (past 50lbs) or less (less than 50lbs) so that the set screws contact the barrel nut on its outer surface? Will this fix my problem?
- Note: I am not blaming either manufacturer for this problem. This may all be caused by my error. I am just looking for help.
Any help is greatly appreciated.


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