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The Marble Arms 5×40 Sight swaps out that tiny factory bead for something you can actually pick up in low light. It uses a tritium insert to give you a glowing aiming point when the sun goes down, plus a recessed white ring that stands out in daylight and twilight. The tritium is a genuine Trijicon vial, which is why Marble Arms is regarded as one of the go-to names for a night bead that doesn't cost a fortune. Folks who run one alongside pistol night sights often say it glows every bit as bright.
This is a versatile little sight. The tritium works great for home defense and predator hunting when there's no ambient light at all, since it glows on its own rather than needing to gather light like a fiber optic rod. During the day, that white ring gives you a clean, quick reference for clays, upland birds, or general range work. It's a solid all-arounder that pulls double duty from dawn patrol to a dark hallway.
The 5×40 thread is the common size on Mossberg 500, 590, and 590A1 barrels, and it fits plenty of other universal shotgun ribs too. The body is CNC-machined steel with a blued matte finish, measuring roughly .32 inches long, 3/16 inches wide, and .21 inches tall, with a 3/32 inch shank. Installation is straightforward: back out the old bead, deburr the threaded hole, add a drop of thread locker, and thread the new sight in while indexing it to face straight up. Some barrels may need a touch of thread trimmed from inside the bore so the bead seats flush, which is normal for this style and easy to sort out.
The recessed white ring is a smart touch since it keeps the ring from getting scratched up and helps it catch light from any angle. Between the daytime ring and the always-on tritium, you're covered in just about any lighting you'll run into.
The 5×40 thread is the standard bead size on the Mossberg 500, 590, and 590A1, so it's a direct swap for most of those barrels. It also fits a wide range of other universal shotgun ribs. If you're unsure, back out your factory bead and confirm it measures 5×40 before ordering.
No. Unlike a fiber optic rod that gathers ambient light, the tritium insert glows on its own around the clock, which is why it works in a pitch-black room or on a moonless night. The recessed white ring handles daytime visibility. That combination gives you a usable aiming point in just about any lighting.
Most people find it a simple job. You remove the old bead, deburr the threaded hole, add a drop of thread locker, and screw the new sight in while indexing it to face straight up. Some barrels need a little thread trimmed from inside the bore so the bead seats flush, which is common for this style and quick to handle with basic tools.
Tritium sights use a Trijicon vial and typically stay usefully bright for well over a decade before the glow gradually fades. It's a self-contained gas vial, so there are no batteries to swap or charging required. You just install it and it works.
| UPC | 871373005530 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 054019 |
| Style | Tritium Beads |
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