Osight K Green Reflex Sight: Compact RMSc Optic with 6 MOA Green Dot
The Osight K Green is a compact open-reflex sight designed for mounting on compact and subcompact pistols with an optics-ready configuration. The sight is equipped with an RMSc mounting base (Shield RMSc footprint) and projects a bright green 6 MOA reticle (dot). Thanks to the 1× magnification, the natural field of view with both eyes open is preserved.
The sight weighs only 29 grams and has a total length of 4.04 cm, so it has virtually no effect on the balance or slide cycle. The housing is made of high-quality 7075-T6 aluminum and offers protection in accordance with the IPX6 water resistance standard. This makes the optic resistant to heavy mechanical stress and use in wet weather conditions.
Key Specifications
- Mounting standard: RMSc base (direct mounting on compatible rails or via an adapter plate)
- Reticle: 6 MOA green dot
- Magnification: 1×
- Optical features: Aspherical lens with multilayer coating to reduce unwanted reflections
- Housing material: 7075-T6 anodized aluminum
- Battery type: 1x CR1620 button cell (side-mounted)
- Battery life: Up to 63,000 hours
- Sensor technology: Automatic motion activation (motion-sensing auto-on/off after 3 minutes of inactivity)
- Warning function: Low-power indicator (flashes 3 times per minute below 2.2 V)
- Dimensions and weight: Length 4.04 cm, weight 29 grams
- Water resistance: IPX6-certified
Advantages of the green reticle and the compact platform
- High visibility of the green dot: The human eye is physiologically more sensitive to the green wavelength range than to red. A green reticle contrasts more sharply against various backgrounds and remains easily detectable in both bright sunlight and twilight, which reduces eye fatigue.
- Rapid target acquisition with 6 MOA: The 6 MOA dot size is optimized for quick alignment at short and medium ranges. The reticle is immediately visible when raising the weapon, without excessively obscuring the target image at typical firing distances.
- Zero Retention During Battery Replacement: The CR1620 battery is located in a side-access compartment. You can replace the battery without unscrewing the optic from the rail. This keeps the existing mount intact and eliminates the need to re-zero the firearm after a battery change.
- Power Management and Readiness: The integrated motion sensor automatically activates the sight at the slightest movement. After three minutes of inactivity, the optic enters sleep mode, extending total battery life to 63,000 hours and ensuring the system is immediately operational when you pick up the weapon.
- Impact-resistant and compact: The 7075-T6 aluminum alloy offers an exceptional strength-to-weight ratio. Internal components are effectively protected against repeated recoil impulses, while the compact, open design maintains a wide field of view over the target area.
Proper installation is essential for reliable and safe operation:
- Installation: Check whether your firearm’s slide is directly compatible with the RMSc standard or if a specific adapter plate is required. Clean the contact surface and secure the optic with the appropriate mounting screws. Tighten them to the manufacturer’s recommended torque using a torque wrench.
- Power On and Setup: Insert the CR1620 battery into the side compartment. Use the adjustment knobs to set the desired brightness for your training environment. Use the precision adjustment screws for elevation and windage to align the reticle at the desired shooting distance.
Practical Use: Once the firearm is at rest, the optic turns off after three minutes. When picked up, the motion sensor immediately activates the reticle at the last-selected brightness level. When the battery voltage drops below 2.2 volts, the sight signals this by flashing rapidly three times per minute, allowing you to replace the battery in a timely manner.
The Osight K Green is primarily intended for sport shooters and firearm owners who shoot with compact and subcompact optics-ready pistols (such as pistols from the Glock MOS subcompact series, the SIG Sauer P365 family, or similar platforms with an RMSc footprint).
The sight is particularly well-suited for disciplines where rapid fire and immediate target identification are key. Shooters who have difficulty focusing on a red dot or traditional front sight often find that the green 6 MOA dot provides a calmer and sharper aiming picture.
In practice, the Osight K Green proves to be a well-balanced and precise optical sight. The choice of a green 6 MOA dot results in excellent target acquisition without delay. The multilayer-coated glass provides a clear field of view with minimal chromatic aberration or edge glare.
The 7075-T6 aluminum construction is robust, and the IPX6 seal provides sufficient protection against rain showers during outdoor training. In particular, the combination of the side-mounted battery compartment, the reliable motion activation, and the light weight of 29 grams makes the Osight K Green a practical and reliable choice in the compact RMSc red dot sight segment.
