The most economical magnetic sight from HIVIZ, the S-Series offers shooters a bright and affordable solution. With interchangeable LitePipes and an easy snap-on base, it's designed for users who know exactly what color sight they prefer. The S-Series fits shotgun ribs ranging from 4.2mm to 11.1mm wide, making it compatible with a variety of shotguns. The Ultra Narrow (S200) fits ribs from .171 to .265 (4.2mm to 6.7mm), the Narrow (S300) fits ribs from .218 to .328 (5.5mm to 8.3mm), and the Wide (S400) fits ribs from .328 to .437 (8.3mm to 11.1mm).