Marble Arms 3-56 Tritium Bead Front Sight

The Marble Arms 3-56 Tritium Bead Front Sight is a replacement front sight bead from Marble Arms (brand part no. 035619), a self-illuminating tritium bead front sight insert. Marble Arms beads thread directly into a barrel’s existing front sight base, letting shooters swap sight-picture styles or replace a worn or damaged bead without buying a whole new front sight. This bead glows without batteries or ambient light, for a visible sight picture in low light. It is sold as an individual replacement bead, not a complete sight assembly.

Key Specifications

• 3-56 threaded stud matches the mounting thread size for a correct, factory-pattern fit.
• Tritium bead glows without batteries or ambient light, for a visible sight picture in low light.
• Individual replacement bead lets you swap just the front sight insert instead of a full sight.

Frequently Asked Questions

What does this bead thread into? It threads into the existing hole on a barrel’s front sight base; confirm your thread size before ordering.

Is this sold with a sight base? No, this listing is for the replacement bead insert only.

Does the tritium bead need batteries? No, tritium beads glow on their own through radioactive decay and never need batteries or charging.

Buy the Marble Arms 3-56 Tritium Bead Front Sight

Order it from our Lubbock, Texas gun shop for fast, insured shipping right to your door. Pick up this Marble Arms replacement bead and browse more gun sights to finish your sight upgrade.