Mini-sized closed red dot sight made by Holosun. CNC machined from 6061-T6 aluminum alloy with oxidized matte black coating, this mini-sized sight weighs 160g and has dimensions of 69x68x39mm. An IP67 rating makes it water and dust resistant as well as shock-proof. Low and 1/3 Co-Witness mount fits Picatinny rails. The 20mm lens glass is covered in anti-scratch and reflection multi-coating. 2 MOA-sized red dot with a 1/2 MOA adjustment value is available. An LED provides two NV modes and ten brightness levels and is adjustable by a side knob. With no parallax and unlimited eye relief, HS403R guarantees quick and accurate target acquisition in all weather and light conditions. The power is provided by a single CR2032 battery in a cover-secured slot giving it a running time of 50000 hours at a medium brightness setting. The set includes a low profile and lower 1/3 Co-Witness mount, rubber lens covers, and an installation set.