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The Marble Arms 3×56 Sight solves a problem every shotgunner knows: that little factory bead disappears the moment the light drops. This one doesn't. It pairs a self-glowing tritium lamp with a recessed white ring, so you get a fast, clean aiming point whether you're calling coyotes at 3 a.m., breaking clays at dusk, or clearing the house in the dark. The white ring sits recessed into the housing, which keeps it from getting scratched up and helps it catch light from just about any angle.
The body is CNC-machined from steel with a blued, matte finish, so it holds up to real use and doesn't throw glare back at your eye. The tritium is the real draw here. Unlike fiber optic beads that need ambient light to glow, tritium keeps working in a pitch-black room, which is exactly why folks running home-defense shotguns and night predator setups gravitate toward it. The bead itself is noticeably bigger and easier to pick up than the pinhead sight most guns ship with.
This is the #3-56 thread version with a roughly 3/32-inch shank, one of the most common front bead threads out there. It threads right into the existing bead hole on a lot of pump and semi-auto shotguns. A few builds may need the shank trimmed slightly from inside the bore or a small file pass on the shoulder so the bead indexes straight and sits flush. Go slow, treat the threads gently, use a quality thread locker, and let it cure before heading out. Double-check that your gun uses the 3-56 thread before ordering, since these sights come in several thread sizes.
Marble Arms has been building sights out of Michigan for well over a century, and this little bead carries that same no-nonsense reputation. It's a budget-friendly way to get most of the performance of the pricier big-dot night sights without epoxying anything to your barrel.
This is the #3-56 thread version with a roughly 3/32-inch shank, which is one of the more common front bead thread patterns found on pump and semi-auto shotguns. It threads directly into your existing bead hole on many models. Before ordering, remove your current bead or check your manual to confirm your gun uses the 3-56 thread, since these sights are offered in several thread sizes.
Tritium glows on its own without needing any outside light, so it stays visible in a completely dark room or in the middle of the night. Fiber optic beads rely on ambient light and go dark once the sun's down. That's the main reason home-defense and night hunting setups tend to favor tritium beads like this one.
For a lot of guns it's a straightforward thread-in job. Some barrels may need the shank trimmed slightly from inside the bore or a light file pass on the shoulder so the bead faces straight up and sits flush. Take your time, use a good thread locker, and let it fully cure before shooting.
Yes, that's the whole point of the dual setup. The recessed white ring gives you a bright, easy-to-catch aiming point in normal light, while the tritium takes over when it gets dark. The recessed design also helps protect the ring from getting scratched up over time.
| UPC | 871373005509 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 035619 |
| Style | Tritium Beads |
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