A Tritium Front Bead for Mossberg 500 and 590 Shotguns
The Meprolight MEPRO TRU-DOT 1340443101 is a green tritium front bead sight for compatible Mossberg 500 and 590 shotguns using a 5-40 threaded bead. It replaces a standard front bead with a self-illuminated sight reference that remains visible in low-light and no-light conditions without batteries, switches, or electronics.
This is a front sight only. It is not a complete front-and-rear rifle sight set, and it is not a rail-mounted optic or ghost-ring sight system. It is intended for shotgun owners who already have a compatible 5-40 bead-sight barrel and want a more visible front reference while keeping the shotgun simple, durable, and close to its factory handling.
Why Upgrade a Mossberg Bead to Tritium?
A plain brass or white bead can work well in daylight, but it can become harder to locate quickly in dim light, against dark backgrounds, or in transitional lighting. The TRU-DOT front bead gives the shooter a green tritium reference that is easier to pick up when a standard bead begins to disappear.
A tritium bead does not replace safe target identification, proper shotgun fit, pattern testing, or a confirmed point of impact. Its role is straightforward: make the front sight easier to find when light is limited while preserving the fast, uncluttered sight picture of a bead-equipped shotgun.
Best Use on a Defensive, Field, or Utility Shotgun
This sight makes sense on a compatible Mossberg 500 or 590 used for home defense, duty-style use, predator control, field use, or general utility where a low-light front reference is valuable. It is also useful for a practical shotgun that may be used with a weapon light, handheld light, or in uneven natural light around barns, vehicles, timber, or camp.
For best results, pattern the shotgun after installation with the exact buckshot, slug, or field load you intend to use. A brighter bead helps you see the front sight, but each shotgun and load combination still needs to be confirmed on target.
Fitment and Installation Considerations
This model is for compatible Mossberg 500 and 590 shotguns with a 5-40 threaded front bead. Confirm the barrel’s actual bead thread before ordering. Shotgun bead threads are not universal, and this Mossberg 5-40 version should not be confused with the Remington 6-48 version.
This is not the correct choice for every Mossberg shotgun barrel. If the shotgun uses rifle sights, a ghost-ring system, a dovetail front sight, a pedestal sight, or another non-bead configuration, select the sight Meprolight lists for that specific setup instead. Installation should be performed carefully so the sight is threaded correctly, secured without damage, and aligned with the bore and rib or barrel sighting plane.
Who Should Choose This Meprolight Mossberg Sight?
This is a strong choice for the shooter who wants a simple, battery-free low-light upgrade for a compatible bead-sight Mossberg shotgun. It keeps the shotgun’s sighting system clean and familiar while adding a visible tritium aiming point for reduced-light conditions.
It is less useful for a shotgun that already has rifle sights, a red dot, a ghost-ring sight set, or a barrel that does not use a 5-40 threaded bead. The value of this product is the simple upgrade: one green tritium front bead for a compatible Mossberg 500 or 590 shotgun.
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