The XS Shotgun Big Dot Tritium Bead Sight (brand part no. SG20023) from XS Sights epoxies directly over an existing front bead on a vent rib shotgun barrel, turning a factory bead into a genuine low-light front sight. It’s built to fit shotgun beads measuring 0.120″ to 0.140″ in diameter, matching most factory Remington-size and common #6 or #26 aftermarket beads (Mossberg’s factory hex-base bead must be replaced first). The oversized tritium Big Dot glows for reduced-light target acquisition while staying low-profile and snag-free in a shoulder holster or scabbard. Installation is a simple epoxy bond over the existing bead, with a matte black finish that blends with factory barrels.

Key Specifications

• Fits shotgun front beads measuring 0.120″ to 0.140″ in diameter on a vent rib barrel.
• Compatible with common #6 or #26 aftermarket beads; a factory Mossberg hex-base bead must be replaced first.
• Installs by epoxying directly over the existing front bead — front sight only.
• Front and rear elements are steel with tritium inserts for low-light visibility.
• Uses a Big Dot configuration for faster sight acquisition in bright or low light.
• Low-profile, snag-free design suited to defensive shotgun use.
• Finished in matte black to match factory barrel finishes.

Frequently Asked Questions

Will this fit my Mossberg? Mossberg’s factory bead has a hex base that must be replaced with a compatible #6 or #26 bead before installing this sight.

Is it tritium? Yes, it uses a tritium insert for visibility in reduced light.

Does it replace the rear sight too? No, this is a front-sight-only upgrade that epoxies over the existing bead.

Buy the XS Shotgun Big Dot Tritium Bead Sight

Turn a defensive shotgun’s factory bead into a genuine XS Sights night sight from our gun sights lineup. Order it from our Lubbock, Texas gun shop for fast, insured shipping right to your door.