HiViz M400 Wide M-Series Magnetic Shotgun Sight Specifications

Why choose the HiViz M400 Wide Magnetic Shotgun Sight?

The HiViz M400 M-Series Wide Magnetic Shotgun Sight is designed for shooters who need a magnetic front sight for a compatible wide shotgun rib. Its snap-on base fits ribs measuring 0.328 to 0.437 inches wide, making it important to measure your shotgun before ordering. HiViz magnetic sights are not compatible with carbon-fiber or aluminum ribs.

The M400 features interchangeable LitePipes in green, red, and HiViz's distinctive two-tone configuration. The included LitePipe options provide flexibility when selecting a visible aiming reference for hunting and target shooting. The snap-on magnetic design attaches to a compatible shotgun rib without requiring a threaded replacement front bead.

The M400 is the wide option in the HiViz M-Series. For a narrower rib, consider the HiViz M300 Narrow Magnetic Shotgun Sight. For an extra-wide rib, see the HiViz M500 Extra-Wide Magnetic Shotgun Sight. Confirm the fit range for each model before selecting a sight.

How wide is my shotgun rib?

The M400 fits compatible shotgun ribs from 0.328 to 0.437 inches wide. Use our Shotgun Rib Width Reference and guide on how to measure shotgun rib width to check your shotgun before ordering.

Choosing Between Red and Green Shotgun Sights

Sight color preference can depend on the background, lighting, and individual visibility. Read our guide to red vs. green shotgun sights for help choosing a color.

Explore Shotgun Sights by Mounting Type

Browse our magnetic shotgun sights for options that attach to compatible shotgun ribs, or explore our screw-in shotgun sights for replacement beads that fit compatible threaded mounting holes. You can also browse our full selection of shotgun sights to find the right option for your shotgun.

Magnetic vs. Screw-In Shotgun Sights

Learn about the differences in fit, installation, and retention in our guide to magnetic vs. screw-in shotgun sights.