515 series optics are feature-packed with options like Quick-release mounts, flip-cap lens covers, kill flash insert, and Holosun’s Multi-Reticle System (MRS). MRS allows the user to choose between the precision of 2MOA dot only, or a fast acquisition 2MOA/65MOA Circle-Dot. 515 series optics are rugged, lightweight 20mm red dot sights with 12 brightness settings, two which are NV-compatible. 515 series optics provide up to 50k hour battery life (Dot-only), 6061 or 7075 (515GM/515CM) Aluminum Housing, and Holosun’s Solar Failsafe and Shake Awake Technology. 515 series optics have Unlimited Eye Relief, are Parallax free, and are IP67 or IPX8 (515GM/515CM) certified waterproof.