- Complete protection against dirt and moisture: With traditional open-reflex sights, the emitter can become blocked by sand, rainwater, snow, or gunpowder smoke. Because the Osight SE MOS’s emitter is completely enclosed in a sealed aluminum housing, the reticle continues to project onto the window under all conditions.
- Direct co-witness without modifications: Because the optic mounts directly on the slide and the emitter is positioned on top, the base is kept thin. You do not need sights with increased “suppressor height” to continue using your standard rear sight and front sight as a backup.
- Zero Retention During Battery Replacement: The CR1632 button-cell battery is located in a compartment on the side of the housing. You can replace the battery without removing the optic from the firearm. This preserves the zero setting, so the firearm does not need to be re-zeroed after a battery change.
- Optically clear, distortion-free image: The combination of an aspherical lens and multi-layer anti-reflective coatings reduces aberrations and delivers a sharp, true-to-life image with high light transmission.
- Flexible aiming aids: Depending on the shooting distance and discipline, you can switch between a precise 2 MOA dot, a fast 32 MOA circle for rapid target acquisition at close range, or both at the same time.

The Osight SE MOS is designed for easy installation and intuitive operation:

- Installation: Remove the original cover plate from your GLOCK MOS slide. Clean the contact surface and place the Osight SE MOS directly onto the slide. Tighten the included mounting screws to the correct torque (use a torque wrench and threadlocker according to the manufacturer’s instructions).
- Power On and Adjustment: Insert the included CR1632 battery into the side compartment. Use the side push buttons to select the desired reticle and adjust the brightness to one of ten settings. The elevation and windage adjustment screws feature a distinct click for precise zeroing at the shooting range.
- Automatic operation: The internal motion sensor activates the optic as soon as the firearm is picked up. If the firearm remains stationary for more than three minutes, the reticle automatically turns off to conserve battery life. As soon as the battery voltage drops below 2.2 volts, the reticle flashes three times every minute as a timely warning to replace the battery.

This red dot sight was primarily developed for firearm owners and sport shooters who use a full-size GLOCK MOS platform (such as the GLOCK 17 MOS, 47 MOS, 45 MOS, or 34 MOS).

The sight is ideal for dynamic shooting sports disciplines (such as IPSC Production Optics) where rapid target transition, a wide field of view, and absolute reliability under intense firing conditions are required. Thanks to its compact size and light weight of 27 grams, the optic does not adversely affect the slide cycle.

In practice, the Osight SE MOS stands out due to its well-thought-out integration with the GLOCK MOS system. While many aftermarket optics require you to compromise on height or adapter quality, this optic immediately resolves that issue with its integrated mount.

The aspherical lens performs exceptionally well: edge distortion is minimal, and the reticle remains stable and parallax-free even with varying eye positions. The 7075 aluminum construction feels solid and withstands the shock of repeated firing without any drift in the aiming point. The side-mounted battery compartment and automatic motion sensor make it a low-maintenance, ready-to-use sighting device. The Osight SE MOS offers a rugged, out-of-the-box closed-emitter solution without the need for modifications to the firearm.