Introduction
The Feyachi RS-27 Red Dot Sight is a versatile and robust reflex sight designed for quick target acquisition and enhanced situational awareness. It features a wide field of view, multiple reticle options, and adjustable brightness settings. Constructed from high-quality aluminum, this sight is built for durability and precision.
Key Features:
- Large Field of View: Tubeless design with a 22 x 33 mm reflex aperture for rapid target acquisition.
- Multi-Reticle System: Two illuminating colors (red and green) with 4 different reticle patterns and 5 brightness levels.
- Precision Adjustments: Parallax corrected with unlimited eye relief. Features full elevation, windage, and brightness adjustments.
- Durable Construction: Precision machined from high-grade aluminum with a matte black anodized finish. Includes a standard profile Picatinny mounting base.
- Automatic Functions: Auto-sleep after 8 minutes of inactivity and auto-wake upon slight movement.
Setup
1. Unpacking and Inspection
Carefully remove all components from the packaging. Verify that all items listed in the 'What's in the Box' section are present and undamaged. The package should contain: 1 x RS-27 Reflex Sight, 1 x Lens Cover, 1 x Allen Wrench, 1 x Optical Cleaning Cloth, 1 x User Manual.
2. Charging the Device
The RS-27 Red Dot Sight is rechargeable via a Type-C port. A full charge takes approximately 1.5 hours. During charging, a red indicator light will be visible. Once charging is complete, the indicator light will turn green.

Image: Feyachi RS-27 Red Dot Sight charging via Type-C, showing charging status indicators and full charge time.
3. Mounting the Sight
The RS-27 comes with a standard Picatinny mounting base. Use the provided Allen wrench to securely attach the sight to any 20mm or 22mm Picatinny rail. Ensure the sight is firmly mounted to prevent movement during use, which could affect accuracy.

Image: Dimensions of the Feyachi RS-27 Red Dot Sight, highlighting its compact size and Picatinny rail compatibility.
Operating Instructions
1. Power On/Off and Color Selection
To power on the device, press the ON/OFF switch. When the device is powered on, press and hold the ON/OFF switch for 3 seconds to switch between red and green reticle colors.
2. Brightness Adjustment
Use the 'Increased Brightness' and 'Reduce Brightness' buttons located on the side of the sight to cycle through the 5 available brightness settings. Adjust the brightness to suit ambient light conditions for optimal visibility.
3. Reticle Pattern Selection
Rotate the 'Reticle Selector Knob' to choose from the 4 different reticle patterns. Select the pattern that best suits your preference and shooting scenario.

Image: Labeled diagram of the Feyachi RS-27 Red Dot Sight controls and features.

Image: Examples of the 4 different reticle patterns available in both red and green illumination.
4. Elevation and Windage Adjustment
Use the 'Elevation Adjustment' and 'Windage Adjustment' knobs to zero the sight. Turn the knobs incrementally to adjust the point of impact until it aligns with your point of aim. Each click typically represents a specific change in impact at a given distance.
5. Automatic Sleep and Wake Function
The RS-27 features an automatic sleep mode to conserve battery. If the red dot sight remains stationary for 8 minutes, it will enter sleep mode. To reactivate the sight, simply shake it slightly, and the red dot will automatically turn on. This function remains active until the battery is fully depleted.

Image: Demonstration of the automatic sleep and wake-up functions.
6. Co-witnessing with Iron Sights
The design of the RS-27 allows for co-witnessing with standard iron sights, providing a reliable backup aiming system.

Image: View through the sight demonstrating co-witnessing with iron sights.
Maintenance
1. Cleaning
Use the provided optical cleaning cloth to gently wipe the lenses. Avoid using abrasive materials or harsh chemical cleaners, as these can damage the lens coatings. For stubborn dirt, a small amount of lens cleaning solution designed for optics can be applied to the cloth, not directly to the lens.
2. Storage
When not in use, store the RS-27 Red Dot Sight in a dry, cool place, away from direct sunlight and extreme temperatures. Ensure the lens cover is in place to protect the lenses from dust and scratches.
3. Battery Care
To maintain battery health, avoid completely draining the battery frequently. Recharge the sight when the indicator suggests low power. If storing for an extended period, ensure the battery has a partial charge (around 50%) and recharge periodically.
Troubleshooting
- No Reticle Display:
- Ensure the sight is powered on.
- Check the battery level and recharge if necessary.
- Adjust the brightness setting to a visible level for current ambient light.
- Reticle Appears Dim or Flickering:
- The battery may be low. Recharge the device.
- Ensure the lens is clean and free from obstructions.
- Inaccurate Aiming:
- Verify that the sight is securely mounted to the Picatinny rail.
- Re-zero the sight using the elevation and windage adjustments.
- Check for any physical damage to the sight or mounting system.
- Cannot Change Reticle Color:
- Ensure the sight is powered on.
- Press and hold the ON/OFF switch for the required 3 seconds.
Specifications
| Feature | Detail |
|---|---|
| Brand | Feyachi |
| Model Name | RS-27 |
| Color | Black |
| Material | Aluminum |
| Objective Lens Diameter | 22 mm |
| Reflex Aperture | 22 x 33 mm |
| Reticle Colors | Red, Green |
| Reticle Patterns | 4 (Dot, Cross, Circle-Dot, Circle-Cross) |
| Brightness Settings | 5 levels |
| Eye Relief | Unlimited |
| Mounting Type | Picatinny (20mm/22mm compatible) |
| Night Vision Compatible | No |
| Charging Port | Type-C |
| Full Charge Time | 1.5 hours |
| Auto Sleep Function | After 8 minutes of inactivity |
| Auto Wake Function | Upon slight movement |
| Dimensions (L x W x H) | 91.4mm x 30mm x 59.9mm (approx. 3.6" x 1.18" x 2.36") |
| Country of Origin | China |
Warranty Information
The Feyachi RS-27 Red Dot Sight comes with a 1-year manufacturer's warranty. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims. The warranty does not cover damage caused by misuse, unauthorized modification, or improper maintenance.
Customer Support
For any questions, technical assistance, or warranty claims regarding your Feyachi RS-27 Red Dot Sight, please contact Feyachi customer support. Refer to the contact information provided on the product packaging or the official Feyachi website.
Product Overview Video
Video: A comprehensive overview of the Feyachi RS-27 Red Dot Sight, demonstrating its features, controls, dimensions, reticle options, auto sleep/wake function, and charging process. The video visually explains how to switch reticle colors and shows the sight in various operational environments.