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 Ultra Narrow and fits ribs from .171" to .265" (11/64" to 17/64") (4.2mm to 6.7mm). This M-Series model is Narrow and fits ribs from .218" to .328" (7/32"-5/16") (5.5mm to 8.3mm). This M-Series model is Wide and fits ribs from .328" to .437" (21/64"-7/16") (8.3mm to 11.1mm).