507 series optics are rugged open reflex micro red dot sights designed for pistol use and feature the Holosun Multi-Reticle System (MRS). MRS allows the user to choose between the precision of 2MOA dot only, 32MOA circle only, or a fast-acquisition 2MOA/32MOA Circle-Dot. 507 series optics feature 12 brightness settings, two which are NV-compatible, and up to 100k hour battery life (Dot-only). Standard features include a 7075 Aluminum housing and Holosun’s Solar Failsafe and Shake Awake Technology. 507 series sights have Unlimited Eye Relief, are Parallax Free, and are IP67 certified waterproof.