Marble Arms .375'' Fiber Optic Glow 37-Mr Front Sight Steel Green

The Marble Arms .375'' Fiber Optic Glow 37-MR is a ramp-mounted front sight built for hunters and shooters who want a sight picture that stands out in the field. Unlike conventional blade sights, this steel front sight combines a gracefully contoured, forward-sloping profile with a glowing green fiber optic rod—giving you a sight that's both functional and visible in low light or brush. If you're running a rifle without a ramp base already installed, this sight won't work for you; if your rifle is ramp-mounted and you want to replace or upgrade your front iron, this is worth a serious look.

Marble Arms has made rifle sights for generations, and the precision shows. The blade is blued steel, finished to complement classic and modern rifles alike. The .060-inch diameter green glow rod is the real differentiator here—it draws light in ways a plain steel blade can't, making it easier to pick up your target in dim conditions or dense timber. The .340-inch wide base is engineered to fit standard ramp mounts, so compatibility is straightforward if you have the right platform.

This is a no-nonsense sight for hunters who want reliable iron sights with a visibility edge. If you prefer fiber optic over tritium, or if you like the idea of a front sight that doesn't require batteries, the green glow rod delivers. It's the kind of upgrade that feels small on the bench but makes a real difference when you're glassing the timber or drawing down on moving game.

Key Features

• Ramp-mounted steel construction for rifles with existing ramp bases
• Green .060'' diameter fiber optic glow rod for low-light visibility
• Gracefully contoured, forward-sloping blade profile
• Blued steel finish compatible with classic and modern rifle aesthetics
• .340'' wide base engineered for standard ramp mounts

Specifications

Frequently Asked Questions

Will this front sight fit my rifle?

The Marble Arms .375'' 37-MR is designed for ramp-mounted rifles. If your rifle has a ramp base, this sight will fit. If your rifle uses dovetail mounts or has no existing ramp, you'll need a different sight.

What's the difference between fiber optic and other sight types?

This sight uses a green fiber optic rod that gathers ambient light to create a glowing aiming point. Unlike tritium sights, fiber optic sights require no batteries and produce brightness based on available light—excellent for hunting in varied outdoor conditions.

Can I use this with a scope mounted above it?

As a front iron sight, the 37-MR is meant to be used with your rear sight for iron-sight shooting. If you're running a scope, iron sights typically serve as a backup and may be co-witnessed depending on your scope height.

Is the fiber optic rod replaceable?

The product record does not specify whether the fiber optic rod is user-replaceable. Contact Marble Arms or a qualified gunsmith for details on rod service or replacement.