The Holosun HS503R is a small compact micro red dot optic that features Holosun’s new Rheo Stat Dial to adjust brightness settings.

Holosun HS503R Micro Circle Dot Sight
CNC T6061-T6 aluminum housing
2 MOA Dot & 65 MOA Circle
Rotate to Change The Reticle
Rotary Switch
10DL & 2NV Brightness Settings
20,000 Hours Battery life At Setting 6 Using Circle Dot Reticle
Low mount and 1/3 Co-witness mount included
IP67
Parallax Free with unlimited eye relief