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Marble Arms has been making rifle sights since 1900, and this 45-MR fiber optic front sight is a perfect example of why folks keep coming back. It pairs a genuine green fiber optic rod with the strength of solid steel, so you get a bright, easy-to-find aiming point without giving up durability. The rod gathers ambient light and glows a sharp green, which makes a real difference when you're trying to pick up your front bead against dark timber, brush, or a shaded target.
This is the ramp-mounted version, meaning it seats into a front sight ramp with a standard 3/8" dovetail. The base measures .340" wide and the sight stands .450" tall, measured from the bottom of the dovetail to the top of the bead. That .450" height is a common upgrade choice when a rifle is shooting a touch high and the rear sight is already bottomed out, since a taller front bead brings your point of impact back down. The blade carries Marble's signature contour, sloping gently toward the muzzle for a clean look that suits lever guns and classic sporters.
The .060" diameter fiber optic rod is the star here. Green tends to read faster to the human eye in most lighting than other colors, so target acquisition feels quicker in the field. Built from steel and blued to a nice finish, it holds up to recoil and years of use without the fragility you find in some plastic-bodied sights.
Installation is straightforward for anyone comfortable working on their own rifle. The sight drifts into the dovetail from the side and can be tapped left or right to zero your windage against the rear sight. Most drop in with just light fitting, and once it's seated it looks factory. If you're unsure of the exact height your rifle needs, Marble's sight height charts are the way to dial it in before you order.
It's built for a ramp-mounted setup with a standard 3/8" dovetail slot, which covers a wide range of lever guns and traditional sporters. The base runs .340" wide, so it seats into ramps cut for that dimension. If your rifle has a front sight ramp with a 3/8" dovetail, this one should drop in with light fitting.
The height is taken from the bottom of the dovetail up to the top of the bead. A .450" front sight is often chosen when a rifle is grouping high and the rear sight is already as low as it will go, since raising the front bead lowers your point of impact. Marble's height charts help you confirm the right number for your specific rifle before ordering.
No, the fiber optic rod is passive. It simply gathers whatever ambient daylight is around and channels it to the tip, glowing a bright green that your eye picks up quickly. There's nothing to charge and nothing to fail electronically.
For anyone comfortable with basic gun work, yes. The sight drifts into the dovetail from the side and can be tapped left or right to set your windage. Most go in with minor fitting, and a proper sight pusher or a brass punch and light hammer makes the job clean.
| UPC | 871373002744 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 604526 |
| Color | GREEN |
| Style | Fiber Optic |
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