HIVIZ(R) M-Series Narrow Magnetic Shotgun Sight. Fits shotguns with ribs from .218″ to .328″ (7/32″ to 21/64″) (5.5mm to 8.3mm). Includes Green and Red replaceable LitePipes in two diameters plus the unique HIVIZ two-toned LitePipes (green LitePipes with a red center).
