510 series optics are wide-view open reflex red dot sights designed for rifle and carbine applications and feature the Holosun Multi-Reticle System (MRS). MRS allows the user to choose between the precision of 2MOA dot only, 65MOA circle only, or a fast-acquisition 2MOA/65MOA Circle-Dot. 510 series optics feature 12 brightness settings, two which are NV-compatible, and up to 50k hour battery life (Dot-only). Standard features include a 6061 Aluminum housing and Holosun’s Solar Failsafe and Shake Awake Technology. 510 series sights have Unlimited Eye Relief, are Parallax Free, and are IP67 certified waterproof