I've gone around a bit with the sights on my RAR standard. This is the model specific Williams made for it.
I sent it back as the elevation adjustment was a set screw that just bore down on the receiver ;-(
Then I got this one but would not adjust enough to get it on target.
Finally
I'd have to rummage through my packages to get the model number of the Williams that's on there now. This is what it looks like.
Rich