The HolosunA(R) 510C-FDE Red Dot Sight delivers fast target acquisition with a crisp, customizable reticle and rugged, solar-powered reliability. Whether for tactical applications, competition, or home defense, this optic ensures confidence in every shot. Multi-reticle system with 2 MOA dot, 65 MOA circle, or both Solar Failsafe technology with CR2032 battery backup Shake Awake motion-sensing activation Parallax-free design with unlimited eye relief Quick-detach mount for Picatinny and Weaver rails 10 brightness settings for daylight and 2 for night vision Aluminum housing with titanium-reinforced hood IP67-rated waterproof and shockproof construction