The M-Series magnetic sight has you covered. It has a snap-on magnetic base and comes with green, red and the uniquely Hiviz two-toned LitePipe. This M-Series model is Wide and fits ribs from .328" to .437" (21/64"-7/16") (8.3mm to 11.1mm).
WARNING: To the state of California, this product is known to have chemicals that cause cancer, birth defects, and harm to the reproductive system.