Marble Arms 6×48 Tritium Bead Shotgun Sight

The Marble Arms 6×48 Tritium Bead Shotgun Sight is a self-luminous replacement bead for shotgun barrels drilled and tapped for a standard 6×48 threaded sight base. Marble Arms has supplied shotgun and rifle sights since the early 1900s, and this tritium bead upgrade gives wingshooters and home-defense shotgun owners a bright reference point that doesn’t rely on ambient light. Because it uses tritium rather than a painted or fiber-optic insert, the bead stays visible in dim dawn, dusk, or low-light conditions where a standard bead disappears. It threads into any factory or aftermarket 6×48 sight base without additional machining.

Key Specifications

• The tritium bead insert glows continuously without batteries or a light source, staying visible in low light.
• It uses a standard 6×48 thread, matching common factory and aftermarket shotgun sight bases.
• Unlike a painted or fiber-optic bead, tritium doesn’t depend on ambient light to stay visible at dawn, dusk, or indoors.
• As a front bead sight, it replaces the factory bead rather than the rear sight, keeping your existing rib and rear sight setup unchanged.
• It suits shotgun platforms used for wingshooting, turkey hunting, or home defense where a fast, reliable front reference matters.

Frequently Asked Questions

Will this bead fit my shotgun barrel? It uses a standard 6×48 thread, which matches most factory and aftermarket shotgun sight bases, but confirm your barrel’s existing bead thread size before ordering.

Why choose a tritium bead over a fiber-optic one? Tritium glows on its own without needing light exposure, so it stays visible in low-light conditions where a fiber-optic bead can go dark.

Buy the Marble Arms 6×48 Tritium Bead Shotgun Sight

Order the Marble Arms 6×48 Tritium Bead Shotgun Sight from Marble Arms through our shotgun parts selection for a low-light-ready bead that threads right into your barrel. Our Lubbock, Texas team can help confirm thread fitment before you order.