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Marble Arms has been building iron sights in Gladstone, Michigan since 1900, and this .312" 31MR fiber optic front sight carries that same reputation. It swaps out a dull brass bead or worn front sight for a bright orange fiber optic rod that soaks up available light and glows, giving you a crisp aiming point that's easy to pick up in low light, at dusk, or against dark targets and timber. If your eyes aren't what they used to be, this is one of the simplest upgrades you can make to a lever gun or open-sighted rifle.
This is the ramp-style version, machined with a .340" wide base to drop into a standard 3/8" dovetail front sight ramp. The blade wears Marble's signature contour, sloping gracefully toward the front, and the whole thing is cut from steel and blued so it looks right at home on a traditional rifle. The .312" height is measured from the top of the bead down to the bottom of the dovetail, and the orange .060" optic rod runs the length of the sight for maximum light gathering.
The .340" width makes this a common fit for ramps found on classics like the Winchester 1894 and Model 70, along with plenty of other lever actions and open-sighted rifles. Shooters running these sights pair especially well with a peep or buckhorn rear, and the glowing front bead tends to shine through nicely even behind an aperture. Most folks report the sight going in with a punch and hammer and only minor fitting, though checking your existing sight height against Marble's chart before ordering is always the smart move.
Bottom line: it's a rugged, made-in-USA fiber optic sight that brings quick target acquisition and that traditional Marble's look to your rifle, and it earns its keep the moment the light starts to fade.
The .340" wide base is designed to drop into a standard 3/8" dovetail front sight ramp, which covers a lot of ground including the Winchester 1894 (pre and post 64) and Model 70. It's a common fit for many lever actions and open-sighted rifles. Since ramp heights vary, measure your current sight against Marble's chart before ordering to make sure you land on the right point of aim.
This is the ramp-mounted version, indicated by the MR in 31MR, with a .340" wide base. If your rifle uses a wider .531" barrel dovetail instead of a ramp, you'd want the 31W barrel-mounted version rather than this one.
The .060" orange optic rod gathers ambient light and glows, giving you a bright, high-contrast aiming point that's far easier to pick up than a dull brass or ivory bead. It really pays off in low light, at dawn and dusk, and against dark backgrounds. Folks with aging eyes tend to notice the difference right away.
Most people install it with a brass punch and a hammer to drift it into the dovetail, and many report only minor fitting is needed. The sight is also windage adjustable by drifting it left or right in the dovetail. If you're not comfortable doing it yourself, a gunsmith can knock it out quickly.
| UPC | 871373002416 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 603125 |
| Color | ORANGE |
| Style | Fiber Optic |
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