Nope, I no longer have an Omega. Do have a couple of Encores and bought one of the Williams peeps from Cabela's but have not installed it. There might be a problem with front sight height and zero - that's why I used the "should" in my post. Since the rifles use the same sights, I still think it would work.

Williams 2004 catalog lists:

FP-T/C For Thompson/Center Encore, Omega, G2, Scout. (Fits factory drilling and tapping on top of receiver) on page 11.

WGRS-ENCORE—For T/C Encore and T/C Omega on page 13

So either they are making the same assumption or those really do work. Again, I have NOT verified this by installing on a rifle.