I've gone around a bit with the sights on my RAR standard. This is the model specific Williams made for it.
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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.
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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.
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Rich