<img src="graemlins/r.gif" border="0" alt="[king]" />
Rick,
Brownells Oxpho Blue is one of the best.
The rear toggle had a dovetail cut in it when I got it, I just had to do some filing to get the MMC sight to fit. I don't think it would be too much of a problem to to cut through the hard "skin" with a Dremel tool, and then use a dovetail slot mill to cut the dovetail.
As an extra anchor, I drilled a small hole thru the receiver and sight base, tapped threads in the sight base and screwed it down from the bottom.
The other problem was that the sight is wider than the toggle, and the toggle wouldn't close down all the way. So I took my "handy-dandy" Dremel tool and inletted slots on the inside of the receiver to allow the sight to fit and the toggle to lock down all the way.
<img src="graemlins/drink.gif" border="0" alt="[cherrsagai]" />