Extar's Take: Holosun is our favorite optics brand regarding features, quality, service, and price. The HS403B is a fantastic entry-level red dot sight with a 2 MOA dot and low parallax. The inclusion of a low mount and high mount in the box makes this a great choice for Extar EP Series firearms, where a riser is not needed. The inclusion of shake-awake is something that we consider essential for a red dot sight, as by the time you pick up the firearm and aim, the dot is already on and ready to go. If you want an optic to put on your Extar firearm and want to save money, we recommend this Holosun HS403B mounted using the included low mount.
HS403B is a 20mm micro sight designed for rifle and carbine applications. HS403B features Holosun’s Red Super LED with 50k hour battery life, 10 daylight and 2 night vision compatible reticle intensity settings. Its housing is made from 6061 aluminum and includes both a lower 1/3 co-witness mount (1.63”) and a low mount (.75”) for low-comb height rifle applications.
Additional features include Shake Awake technology, digital buttons for setting changes, rubber lens covers, and a side-mounted battery tray for the 2032 battery. HS403B is a versatile sight for users of all levels.
- 2 MOA Reticle.
- Up to 50,000 Hours of Battery Life. (Setting 6)
- 12 Brightness Settings. 10 are Daylight settings and 2 are Night Vision settings.
- Easy-access side-mounted battery tray.
- Parallax-free and unlimited eye relief.
In The Box:
- Lower 1/3 Cowitness Mount (High mount)
- Low Profile Mount
- T10 L Key
- Rubber Lens Cover
- CR2032 Battery
- Lens Cloth
- User Manual