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HOLOSUN HS403B "Shake Awake" Compact Red Dot Sight w/ Low & AR Mount

ID: 84394 (RD-HS403B)
5.0 stars, based on 2 reviews
HOLOSUN HS403B Shake Awake Compact Red Dot Sight w/ Low & AR Mount
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MAP ProtectedExempt From Coupons
The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.
Non-Export ItemShips Inside USA Only
This is an export-restricted item and can only be shipped within the United States. No international delivery for these items.
Free ShippingNo Coupon Required
Free shipping within lower 48 US states, no coupon code needed!


  • Precision CNC machined from T6061-T6 aluminum
  • 50,000 hours of operation on one battery; 25,000 hour battery life on setting 10
  • Designed for day and night use; Red - 2 MOA dot size; memory function for brightness setting
  • Parallax-free with unlimited eye relief
  • Unaffected by extreme weather conditions
  • Low mount & 1/3 co-witness (AR) mount included (Works with Picatinny & Weaver rails)
  • Shake Awake automatically turns optic on when movement is detected, optic will auto shut off when no movement is detected
The 403B is a small compact micro red dot optic. Employing Holosuns LED technology, the lifetime for one CR2032 battery can be up to 5 years. This optic features our Shake Awake technology that powers the optic on with slight movement of the 403B. It may be installed on various firearms such as shotguns, pistols ,air rifles and crossbows. The HS403B is compatible with standard mounts.

Shake Awake: Another great piece of technology created by Holosun is Shake Awake. This great feature allows an optic to automatically go to sleep when the unit has not detected any type of movement or vibration in a specific amount of time that is programmable by the operator. However, once the unit senses movement, it will automatically turn itself on and recall the last brightness that was used. This great feature helps promote battery life further and insures the unit is on and ready when you need it!

Dimensions (inches): 2.44 x 1.18 x 1.45
Weight (oz): 4.3
Magnification: 1X
Adjustment Per Click: 0.5 MOA
Battery: CR2032
Package Includes: Optic, Low Mount, 1/3 Co-Witness (AR) Mount, Battery, Hex Keys

Manufacturer: HOLOSUN

2 Customer Reviews

(Write a review)

by Logan A. on 05/20/2021
"This sight is amazing, I have owned mine for over 5 months and have not needed to change the battery, it lasts for ever.

Runs easily available batteries
long battery life
Great price for an amazing red dot
dot is clear
easy windage and elevation adjustments, no screwdriver needed just use the cap
Comes with riser for hard lower face masks
Changes intensity based on inside or outside

uses a tiny torx screw to secure battery
uses torx for securing to picatinny

Other than that this sight is amazing
im 17 with perfect eyesight, I have no clue how this will behave with glasses
by Skydan L. on 11/27/2019
"Best Red dot for the price
Battery life is about 1,205,039 gallons of milk
Strong (I’ve dropped it and it’s chillin)
Very bright or not if you don’t want it to
Crisp red dot
Looks nice
Tinted so sun problems nope
Nice box
Other things
Only red dot but that’s the model type
Need tool to put on and battery compartment is weird but comes with tools

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