Welcome to the forum. I don't think you need to buy anything. Just cut a small patch from a white plastic aspirin bottle, superglue it to the sight, and use an exacto knife to shave the overlap down to the face of the blade. Some people just hit the rear face of the front sight with some refrigerator touch-up paint. Seems to me most ramp sights have colored inserts rather than glue-ons, so I would probably go with paint. In fact I did just that with the ramp front sight of a 649.
We want to see pictures of the CM!
