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Marble Arms has been making iron sights since 1900, and this 31-MR fiber optic front sight carries that same reputation for solid, dependable hardware. The green fiber rod pulls in ambient light and glows bright, giving you a sharp aiming dot that jumps out against dark timber, brush, or a shaded range at dusk. It stands .312" tall at the bead and mounts into a standard 3/8" ramp dovetail, making it a straightforward swap for the factory bead on a lot of lever actions and other classic rifles.
Plenty of folks pick this sight up because a plain brass or black front bead gets hard to see once your eyes have a few decades on them. The green glow tube changes that in a hurry, giving you a fast, high-contrast reference that's easy to line up quickly. It's a favorite on Winchester, Marlin, Henry, and Rossi lever guns, and it pairs nicely with a peep or Bullseye-style rear sight for a genuinely quick sight picture.
This one is machined from steel, not pot metal, so it holds up to recoil and years of field use without going soft. The classic Marble's contour keeps the look of your rifle traditional while adding modern visibility, and the fiber tube runs long enough down the blade to grab light from just about any angle. Installation is typically done with a punch and a light tap, and some rifles may want a little minor fitting to dial in a snug dovetail.
Height is measured from the top of the bead to the bottom of the dovetail, so if you're replacing an existing sight it pays to measure your original before ordering to keep your point of aim on track. For low light and shorter to mid range work, it's tough to beat the clarity this green glow delivers.
This sight mounts into a standard 3/8" ramp dovetail, which covers a lot of Winchester, Marlin, Henry, and Rossi lever guns. Fit can vary by model, so the smart move is to measure your existing front sight height and dovetail before ordering. A little minor fitting with a file or punch is common to get a snug, secure fit.
It stands .312" tall, measured from the top of the bead down to the bottom of the dovetail. Since replacing a front sight affects your point of impact, compare that height against your current sight so your zero stays close. Going taller or shorter shifts where the rifle prints, so matching height matters.
The green fiber tube gathers ambient light and glows clearly, which makes it a strong pick for dawn, dusk, and shaded conditions. Users regularly point to it as a big help for aging eyes and quick target acquisition at shorter to mid ranges. In very dim light it still needs some ambient light to feed the fiber, but it outshines a plain bead in most field conditions.
Most folks install it by drifting the old sight out and tapping the new one in with a brass punch and a light hammer. Take your time and support the barrel so you don't mar the dovetail. If the fit feels too tight, a touch of careful filing on the base usually dials it in without over-loosening.
| UPC | 871373002423 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 603126 |
| Color | GREEN |
| Style | Fiber Optic |
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