HOLOSUN HE403B-GR

The Holosun HE403B-GR is a 20mm micro-optical sight designed for rifle and carbine applications, and it puts a crisp green dot on target in almost any light. Green Super LED technology and up to 50,000 hours of battery life make the Holosun HE403B-GR a set-and-forget red dot alternative. Twelve brightness settings cover everything from bright daylight to night vision use. This is a lot of durable optic in a compact housing.

What the Holosun HE403B-GR is and who it is for

This micro sight is built for shooters running ARs, carbines, and other rifles who want fast, both-eyes-open target acquisition. Holosun uses a green emitter here, which many shooters find easier to pick up quickly than a red dot, especially against green foliage.

The parallax-free design and unlimited eye relief mean the dot goes where the gun points, no matter your head position. Whether you are running drills, hunting, or building a defensive carbine, this sight keeps things simple and fast. It is a proven platform at a fair price.

Key features of the Holosun HE403B-GR

• 2 MOA green dot reticle for a fine, precise aiming point.
• Green Super LED with up to 50,000 hours of battery life on a mid setting.
• 12 brightness settings including 10 daylight and 2 night vision compatible levels.
• Shake Awake technology powers down when idle and wakes on movement.
• 6061 aluminum housing for durable, lightweight service.
• Includes a lower 1/3 co-witness mount and a low profile mount.

Specifications woven together

The HE403B-GR is a 20mm micro sight with a 2 MOA green dot, fine enough for precise shots yet fast to find up close. The Green Super LED delivers up to 50,000 hours of runtime, so you can leave it on and simply trust it. Multilayer reflective glass keeps the sight picture clear and true.

The housing is machined from 6061 aluminum to shrug off recoil and field abuse, and a convenient tray battery compartment makes swapping the CR2032 easy without dismounting the optic. It ships with a lower 1/3 co-witness mount at 1.63 inches and a low mount at 0.75 inches, so you can set the correct height for your rifle. A T10 L key, rubber cover, battery, and lens cloth are included in the box.

Setup, care, and compatibility

Choose the included mount that matches your comb height, torque it to a standard rail, and zero at your preferred distance. The 12 brightness settings let you tune the dot for a sunny range day or a night vision setup. Round out the build with accessories from our optics collection.

Maintenance is minimal thanks to Shake Awake and the long battery life. Wipe the glass with the included cloth, keep the cover on in storage, and check zero after hard use.

Fast and dependable

A quality micro red dot earns its place by being simple and fast. You keep both eyes open, put the dot on the target, and press. There is no parallax to fight and no fixed eye relief to find, so the sight works from any awkward position you end up shooting from.

The green emitter is easy on the eye and stands out well against natural backgrounds, and the 2 MOA size is fine enough for precise shots yet quick to pick up in a hurry. With up to 50,000 hours of runtime and Shake Awake, you can mount it, zero it, and forget about the switch.

The included mounts let you set it up for an absolute co-witness with backup irons or run it low on a rimfire or dedicated carbine. It is a versatile little optic that fits a huge range of builds.

For a rugged, efficient green dot, the Holosun HE403B-GR is hard to beat. Ships direct to your door, no FFL required.