Ruger Security Six
Those of us who have a Ruger Security Six are pretty much out of options when it comes to replacing the factory red ramp sight. I was able to fit this Classic / DX sight in a few minutes by rounding the bottom with a dremel. Stock red ramp S&W sights and Dawson's standard pinned S&W sights did not sit down far enough for my application. It is not flush with the front of the barrel, but it covers the sight channel. Night and day difference from the standard sight.