Holosun Primary Arms HS503-G ACSS CQB Collimator - Black

HS503-G collimator sight developed in collaboration with Primary Arms. Its enclosed design provides enhanced protection for the optical system against external factors. The model is equipped with an ACSS CQB reticle. The housing is made of durable, damage-resistant T6061 T6 aluminum, and the seals used protect against water and dust. It is powered by a battery.

The device's housing is made of durable 6061 T6 aluminum with a black anodized finish. The design is vibration-resistant up to 1,000 G and meets the IP67 standard, which ensures protection against dust and submersion in water for up to 30 minutes at a depth of up to 1 meter. The operating temperature range of -10 to +50 degrees Celsius allows the sight to be used in a variety of environmental conditions.

The model is equipped with an ACSS CQB sight, which enables effective firing at both short and longer ranges using common calibers. The collimator has 10 levels of reticle brightness adjustment and an additional 2 brightness levels optimized for use with night vision devices. When turned off, the device remembers the last-used reticle and its brightness setting.

The automatic brightness adjustment system adapts the reticle brightness to the surroundings, while manual mode allows for precise adjustment according to the user’s preferences. Reticle position adjustment is performed with an accuracy of 1 MOA per click within a range of +/- 50 MOA, enabling precise aiming.

The collimator uses a 20-mm-diameter circular reticle, which provides a clear image and makes it easy to quickly acquire the target. Multi-layer anti-reflective coatings improve light transmission, and minimized parallax allows for intuitive aiming regardless of the viewing angle.

The collimator is powered by a CR2032 battery, which provides up to 50,000 hours of operation, thanks to the use of a highly efficient LED and control electronics. A low battery is indicated by a flashing reticle. The second power source is the Solar Failsafe system, which relies on a solar cell located on top of the housing. Depending on the light intensity, the solar cell either fully powers the LED or works in conjunction with the battery.

The Shake Awake system uses a motion sensor that automatically wakes the device from sleep mode when it detects weapon movement. If there is no activity, the red dot sight enters sleep mode after 10 minutes, which significantly reduces power consumption and extends battery life.

The collimator is equipped with a 1/3 Co-Witness mount with a height of 1.63 inches (41 mm), which allows it to be mounted on Weaver/Picatinny/RIS rails with a diameter of 22 mm. Additionally, the set includes a low-profile mount.

• closed design
• energy-efficient LED
• 12 brightness levels: 10 daytime + 2 for night vision
• ACSS CQB reticle
• multi-layer lens coating
• shock-resistant aluminum housing
• IP67 waterproof rating
• 22 mm rail mount
• Shake Awake function