20 mm micro red-dot sight for rifle and carbine use with a 2 MOA dot, rotary brightness control and CR2032 battery. The HS403R includes both a lower-1/3 co-witness mount and low mount, provides 10 daylight plus 2 night-vision-compatible settings and carries an IP67 environmental rating. Holosun now marks this model as discontinued.
WHAT MATTERS
2 MOA Dot Reticle
20 mm micro sight with a single 2 MOA dot and unlimited eye relief.
Up to 100,000-Hour Runtime
The official specification section rates battery life up to 100,000 hours at setting 6.
12 Brightness Settings
Ten daylight and two night-vision-compatible intensity settings controlled by a rotary switch.
Dual Mounts Included
Includes a 1.63-inch lower-1/3 co-witness mount and a 0.75-inch low-profile mount.
IP67 Environmental Rating
Holosun rates the sight IP67 for submersion protection and specifies 1000G vibration resistance.
GTW TAKE
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Best Value
The Holosun HS403R is the value pick because it keeps the setup simple: a 2 MOA dot, long battery-life spec, rotary brightness control, and a compact enclosed housing. For thick-woods hunting, the appeal is not extra reticles or tactical features; it is a clean aiming point at a more approachable price.
