HOLOSUN HS403R User Manual Download Page 2

Elevation 

Adjustment

Windage 

Adjustment

Protective Cap

Protective Cap

Fig 7

3

4

HS403R

Red Dot sight

Holosun Technologies  Inc.

www.holosun.com

1. The elevation adjustment turret is on the top, the windage 
adjustment turret is on the right side (see Fig7). The sight has 
been factory adjusted for approximate zero at 25 yards.
2. The built in screwdriver tool on the protective cap can be 
used for zeroing adjustment (see Fig7). See label inside cap.
3. First remove the protective cap, then position slot type 
screwdriver into the adjustment turret slot, then rotate
counterclockwise or clockwise to adjust point of impact.
Each click has an adjustment value 0.5 MOA.
4. Adjust the Elevation turret counterclockwise to move the point 
of impact UP.  Adjust the Windage turret counter- clockwise to 
move the point of impact to the RIGHT. Turning either turret 
clockwise moves the point of impact in the opposite direction.

This device is a precision instrument that deserves reasonably 
cautious care. The following tips are provided to ensure long 
lasting use of the sight.
The optical system includes the objective lens and occular lens 
which are multi - coated optical glass. When cleaning the lenses 
blow away any  dust on surface, wet the lens with lens cleaner or 
clean water, wipe fingerprints and oil stains with lens tissue, soft 
cotton, or microfiber cloth. No special maintenance is needed for 
the housing surface. Avoid touching the glass surface with dry 
cloth or tissue paper . No organic solvents such as alcohol, acetone 
should be used. Do not try to dismantle the device as the internal 
parts are specially cleaned and sealed and with anti - fog 
treatment. Any such attempt will void the warranty.
If repair is needed, please call our customer service center, visit our 
website ,or send us email.

SUMMARY            
We provide a limited lifetime warranty from the date of purchase 
on parts and workmanship to the original purchaser. 
At our sole discretion, we will repair or replace a product found to 
be defective under normal use and service without charge 
excluding any delivery costs, which will be born by purchaser. We 
will not be liable for incidental, consequential, or special damages 
arising out of or in any connection with the use or performance of 
this product.  This warranty is void if 
the product has been misused, modified, neglected, or 
disassembled prior to its return.        
Please refer to http://www.holosun.com for current and complete 
warranty information.

Customer Service

Phone: 909-594-2888

Email: [email protected]

Sight operation

Zero setting

Gear Knob

1

2

3

4

5

6 7

8 9 10

11

12

Limited warranty

Maintenance & care

The brightness settings are 
adjusted using the rotary switch 
that is integrated with the 
battery compartment (Fig5). 
The HS403R has a total of 12 
brightness settings.

To select a setting, align the brightness setting number on the 

rotary switch with the "

△" 

symbol on the body. 

For Rotary Switch Settings see Fig6.

Fig 5

Fig 6

5. Caution: 
Do not try to over rotate the turrets. If you feel the turrets can not 
be rotated, this indicates you have reached the adjustment limit, 
otherwise the device may be damaged. If the  required 
adjustment range is beyond the limits, consider adding an extra 
spacer between  the device and mounting rail to allow for 
additional adjustment.

1.Power OFF: The "0" setting will power OFF the optic.
2. Dot Brightness Adjustment
Settings 1 and 2 are night vision compatible settings for use with 
night vision devices.
Settings 3 through 12 are daylight visible settings. Dot brightness 
will increase as the setting number increases.
3. Reticle 

:

the reticle of the 403R is a 2MOA dot. 

V1.2

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