Thunder Mountain Custom Fiber – Bright, Durable Red Fiber for Firearm Sights – Red – .040

Upgrade Your Sight Picture with Unmatched Brightness and Reliability

First and foremost, Thunder Mountain Custom Fiber delivers exceptional brightness, flexibility, and durability for firearm sights. Furthermore, unlike standard fiber replacements, this high-quality fiber ensures that your sights remain visible and precise under every lighting condition. Consequently, whether you are shooting in bright daylight or transitioning into low-light situations, this fiber stands out, helping you acquire targets faster and more accurately.

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Optical-Quality Core for Maximum Light Transmission

Brighter, More Vivid Sights Every Time

The fiber is constructed with an optical-quality polymer core, which is doped with highly efficient fluorescent dyes. Additionally, a low-refractive-index fluoropolymer coating surrounds the core, allowing both visible and ultraviolet (UV) light to fluoresce. Therefore, the light transmitted through the fiber appears brighter and more vivid than conventional options—over 30% brighter, even on cloudy days. As a result, your sight picture remains clear, consistent, and easier to track during rapid target acquisition.

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Durable and Flexible for Tough Environments

Maintains Performance Under Harsh Conditions

Not only is Thunder Mountain Custom Fiber bright, but it is also incredibly strong and flexible. Because of this durability, it withstands harsh environments, rough handling, and repeated adjustments. Moreover, even after repeated bending or exposure to solvents, the fiber retains its structural integrity, which ensures consistent performance shot after shot. Consequently, you can trust your sights to remain reliable during prolonged use, competitive matches, or tactical applications.

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Precision for Competitive and Tactical Shooting

Optimized for Speed, Accuracy, and Control

Thanks to its superior optical properties and resilient construction, this fiber excels in competitive, tactical, and recreational shooting scenarios. Furthermore, the bright red color promotes fast, intuitive sight alignment, while the flexible material allows for precise cutting and fitting to your specific sight requirements. Therefore, you achieve professional-grade performance that simultaneously enhances speed, accuracy, and confidence on every shot.

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Key Features and Benefits

Small Upgrade, Major Improvement

• Bright, fluorescent red fiber – over 30% brighter than standard fibers

• UV-enhanced for consistent visibility in all lighting conditions

• Optical-quality polymer core for efficient light transmission

• Low-refractive-index fluoropolymer coating

• Flexible and strong for repeated use and rough handling

• Solvent-resistant for long-term durability

• Ideal for firearm sights, including competitive and tactical applications

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Why Choose Thunder Mountain Custom Fiber?

Superior Materials for Reliable Sight Performance

Instead of paying a dollar per inch for low-quality replacement fibers, Thunder Mountain Custom Fiber provides unmatched brightness, durability, and consistency. Moreover, its unique materials ensure that your sights remain visible, precise, and reliable under virtually any condition. Consequently, upgrading your firearm sights with this premium fiber results in faster target acquisition, greater shooting confidence, and enhanced overall performance on the range.

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Available Color and Size

• Color: Red

• Diameter: .040