The Holosn HS507K is a micro red dot sight that is easy to use and has great features for both real steel and airsoft shooters alike!

Holosun HS507K Reflex Circle Dot Sight
2 MOA Dot & 32 MOA Circle
Dot, Circle, Circle Dot Reticle Options
CR1632 Battery with Side Mounted Battery Tray
50,000 Hours Battery Life at Setting 6
10DL & 2NV Brightness Settings Under Manual Modes
Locking Function and Motion Sensor
CNC Milled 7075 Aluminum Housing
Waterproof
Parallax Free