Last year I used the SeeAll sight, which, near as I could tell, was marginally legal in WA.
I was comfortable out to 200 yards with it.
This year I知 going to try the Williams Western Precision. It痴 personably the one that was just mentioned, as it screws directly to the barrel.
Which model of the UML did you get? The Bells and Carlson version provides some special challenges because of the high cheek piece. I知 guessing that might be the one you have, since the other Version comes with iron sights.