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User's Manual
www.holosun.com
Red Dot Sight
HS403R
Fig1 HS403R Micro Sight
Important
Notices
1. Ensure that the firearm is completely
unloaded and safe before device installation or
installing a new battery.
2. Please keep the packaging should you need
to make a warranty claim.
1) Up to 100,000 hour battery life .
2) Reticle : 2MOA Red dot only.
3) Parallax free, unlimited eye relief.
4) 10 daylight and 2 night vision compatible reticle brightness
settings.
5) CNC milled 6061 aluminum mount.
6) Protective shrouds on windage and elevation turrets.
7) Includes a 1.63" Absolute Co-witness mount and low mount.
8) Waterproof: IP67
Objective Lens
Fig2
Battery
Fig3
Caution:
Removal or damage to the O-ring inside the battery cap will cause
moisture ingress which may damage the electrical circuits and
device.
Fig 4
Installation
T10 Crossbolt
Clamp
Model
Features
O-ring
Battery Compartment
2032 Battery
Battery Cap
HS403R
Red Dot
Thank you for purchasing the HS403R Micro Sight with
2MOA Dot. Before operation please read the User Manual
carefully.
Reflex sights have an objective lens that is positioned at an
angle in order to properly reflect the reticle/dot.
The objective lens must be perpendicular to the LED which
projects the light that is reflected off of the front lens and
produces the reticle/dot you see.
1. The operating voltage for this device is DC3V using one high
quality CR2032 Lithium battery which is included with purchase.
2. A high quality battery can power this 2MOA Dot optic for
up to 100,000 hours.
Caution: Do not use a rechargeable battery.
3. Please see Fig 3 for battery installation and replacement:
1) Remove the battery cap by rotating counterclockwise.
2) Remove the old battery if applicable. Install a new battery
with the POSITIVE side facing outward (Fig.3).
3) Replace the battery cap by rotating clockwise.
1. The included mount is designed for use with a 1913 Picatinny
rail only.
2. To install the optic, loosen the T10 crossbolt with the supplied
T10 Torx tool. Attach the optic onto the Picatinny rail in a
suitable location. Push the optic forward towards the muzzle
and tighten.(Fig4)
