
Availability: In Stock
Current Stock: Out of stock
The Meprolight Sights ML63145 Fiber-Tritium Bullseye Red Sight for Ruger Mk III/IV brings fast, reliable target acquisition to your rimfire pistol without batteries or electronics. This compact optical sight combines fiber-optic and tritium illumination in a single low-profile design, giving you an illuminated dot and circle bullseye aiming point that works in bright daylight, dim indoor ranges, and everything in between. Built for shooters who want intuitive sight picture and genuinely quick acquisition—without fumbling with switches or worrying about dead batteries.
The dual-illumination system is the smart engineering here. Fiber optics drink in ambient light during the day, keeping your aiming point bright and sharp in sunlight or at the outdoor range. When the sun sets or you're working indoors, premium-grade tritium takes over automatically, providing a self-illuminated sight picture that lasts for years. This sight installs directly to the existing dovetail on Ruger Mk III and Mk IV pistols and eliminates the need for a front sight, keeping your sight radius intact and your gun profile low enough to fit most holsters you already own.
If you shoot your Ruger across variable lighting—dawn practice sessions, indoor matches, home defense readiness—the Meprolight Bullseye removes one variable from the equation: you'll always have a usable sight picture. No switches to flip, no batteries to replace, no wondering if your optics are still alive. Simple installation, immediate reliability, and a red bullseye that meets you where the light is.
| Brand | Meprolight Sights |
| Model | ML63145 |
| Sight Type | Fiber-Optic Tritium Bullseye |
| Compatibility | Ruger Mk III, Ruger Mk IV |
| Illumination | Fiber-optic (day) and tritium (night/low-light) |
| Aiming Reticle | Red dot and circle bullseye |
| Battery Required | No |
| Tritium Life | 12 years |
| Installation | Dovetail mount |
Yes. The Meprolight ML63145 is designed to mount directly to the dovetail on both Ruger Mk III and Mk IV pistols.
No. The sight uses no batteries, switches, or external power. The fiber-optic element collects ambient light during the day, and the tritium provides self-illumination in low light and darkness automatically.
Most existing holsters will accommodate this sight because of its low-profile design. However, holster fit can vary by model, so if you use a holster designed for your specific pistol, test the fit before relying on it in the field.
The tritium illumination is guaranteed for 12 years from the date of manufacture.

SKU: 167524657 • Width: 4.75in • Height: 0.75in • Depth: 9in • Weight: 0.105oz





Availability: In Stock
Current Stock: Out of stock
The Meprolight Sights ML63145 Fiber-Tritium Bullseye Red Sight for Ruger Mk III/IV brings fast, reliable target acquisition to your rimfire pistol without batteries or electronics. This compact optical sight combines fiber-optic and tritium illumination in a single low-profile design, giving you an illuminated dot and circle bullseye aiming point that works in bright daylight, dim indoor ranges, and everything in between. Built for shooters who want intuitive sight picture and genuinely quick acquisition—without fumbling with switches or worrying about dead batteries.
The dual-illumination system is the smart engineering here. Fiber optics drink in ambient light during the day, keeping your aiming point bright and sharp in sunlight or at the outdoor range. When the sun sets or you're working indoors, premium-grade tritium takes over automatically, providing a self-illuminated sight picture that lasts for years. This sight installs directly to the existing dovetail on Ruger Mk III and Mk IV pistols and eliminates the need for a front sight, keeping your sight radius intact and your gun profile low enough to fit most holsters you already own.
If you shoot your Ruger across variable lighting—dawn practice sessions, indoor matches, home defense readiness—the Meprolight Bullseye removes one variable from the equation: you'll always have a usable sight picture. No switches to flip, no batteries to replace, no wondering if your optics are still alive. Simple installation, immediate reliability, and a red bullseye that meets you where the light is.
| Brand | Meprolight Sights |
| Model | ML63145 |
| Sight Type | Fiber-Optic Tritium Bullseye |
| Compatibility | Ruger Mk III, Ruger Mk IV |
| Illumination | Fiber-optic (day) and tritium (night/low-light) |
| Aiming Reticle | Red dot and circle bullseye |
| Battery Required | No |
| Tritium Life | 12 years |
| Installation | Dovetail mount |
Yes. The Meprolight ML63145 is designed to mount directly to the dovetail on both Ruger Mk III and Mk IV pistols.
No. The sight uses no batteries, switches, or external power. The fiber-optic element collects ambient light during the day, and the tritium provides self-illumination in low light and darkness automatically.
Most existing holsters will accommodate this sight because of its low-profile design. However, holster fit can vary by model, so if you use a holster designed for your specific pistol, test the fit before relying on it in the field.
The tritium illumination is guaranteed for 12 years from the date of manufacture.
SKU: 167524657 • Width: 4.75in • Height: 0.75in • Depth: 9in • Weight: 0.105oz
