The Holosun HS507C-X2 Reflex Sight is a great option, because it's loaded with tech that gives you options and keeps you shooting, no matter what. This model, for example, features Holosun's Multi-Reticle System, so you can choose the reticle design that best fits your shooting.
Designed for use on personal-defense handguns, this Holosun HS507C-X2 Reflex sight is outfitted with a large viewing window that'll help you get on target and check out what's going on downrange. The sight features a battery life of up to 50,000 hours on setting 6, so you won't have to worry about changing it anytime soon. Even when you do have to change it, the battery tray slides out from the side of the sight, so you don't have to take the optic off your gun.
One of the other great features the Holosun HS507C-X2 Reflex Sight has is its Lock Mode. This locks all of the settings on the optic, so any button pushes that happen when your gun is in its holster won't affect the sight arrangement you choose. The optic also features Shake Awake technology to conserve battery life, and it even has a back-up Solar Failsafe technology that uses the power of the sun to keep your optic in the fight. The 7075-T6 aluminum housing is built to handle anything you throw at this thing, so you can carry with confidence