Last month, Borris Optics revealed their Burris FastFire C red dot sight... "Introducing the FastFire™ C, Burris Optics' latest innovation in red dot optics, designed specifically for sub-compact and micro-compact pistols used in everyday and concealed carry. Weighing less than one ounce, the FastFire C offers durability and reliability, featuring an "Always On" technology with a 25,000-hour run time, powered by a CR2032 battery.
Genuine Burris Red Dot Sight in stock right now at eHobby Asia... "FastFire sights are light, small and tough, placing a powerful bright red 3 MOA dot on your target. FastFire III models have three manual brightness settings and an automatic brightness setting with a top-mounted battery (CR1632), and upgraded windage and elevation adjustments.