Marble Arms .312'' Fiber Optic Glow 31-Mr Front Sight Steel Green

The Marble Arms .312" Fiber Optic Glow 31-Mr front sight is a steel replacement front sight built for shooters who want a bright, reliable aiming point on their rifle. The green fiber optic rod glows in daylight and low-light conditions, giving you a fast visual reference without batteries or electronics. This is a ramp-mounted sight with a .340" wide base, designed to work with rifles that accept standard ramp-style front sights. The blade itself is steel and blued to match traditional rifle finishes, combining functional optics with classic aesthetics.

Marble Arms has a long reputation for precision-made open sights, and this glow sight carries that tradition forward. The .060" diameter fiber optic rod is the sight picture—bright and compact—while the contoured steel blade provides structural integrity and a professional look on your rifle. Whether you're setting up a hunting rifle, a legacy gun, or a shooter looking to replace worn factory sights, this front sight gives you a non-powered aiming solution that's durable and easy to use.

Installation requires that your rifle have a compatible ramp-mounted sight dovetail. The .340" base width is the standard for ramp mounts on many rifles. If you're unsure about fitment or need to verify your rifle's sight system, reach out to our team—we can help confirm compatibility before you order.

Key Features

• Green fiber optic rod (.060" diameter) for bright, visible aiming point in daylight and low light
• Steel construction with blued finish for durability and traditional rifle aesthetics
• Ramp-mounted design with .340" wide base
• Gracefully contoured blade profile
• No batteries or electronic components required

Specifications

Frequently Asked Questions

Will this front sight fit my rifle?

This sight is designed for ramp-mounted bases and has a .340" wide base. Your rifle must have a compatible ramp-style sight dovetail to accept this sight. We recommend verifying your rifle's sight system before ordering. Contact us if you're unsure about compatibility for your specific model.

Does the green fiber optic glow in the dark?

The green fiber optic rod is bright in daylight and low-light conditions, gathering available light to create a visible aiming point. It does not use batteries or independent illumination, so its visibility depends on ambient light levels.

What's included with this sight?

The product includes the front sight with the green fiber optic rod and steel blued blade. Installation hardware and detailed fitting instructions are not specified in the product information; contact us for complete assembly details.