The Holosun SCS-MOS (Solar Charging Sight) represents the next step in the evolution of pistol mounted red dot sights. The SCS-MOS uses an incredibly low profile mounting deck that is compatible with Glock pistols with the MOS configuration, allowing the use of standard-height iron sights. Holosun SCS sights, use solar power, an integrated rechargeable power source, and an automatic and manually adjustable reticle brightness system to ensure your sight is always ready.