Holosun HS403C Paralow Solar Powered Red Dot Sight - 2 MOA

Manufactured by Holosun
Manufactured by Holosun
16 Reviews

In Stock

NOTE: Limit 5 per household. Quantities exceeding 5 will not allow checkout.

We are fully staffed and processing orders. Standard orders are shipping in approximately 1 business days or less. FFL orders take approximately 10 business days or less if you can provide us an actively receiving FFL location. Due to high demand, there is a limit of 5 FFL items in a 30 day period.



Out of the box, this red dot is automatically solar powered. The red dot intensity also auto adjusts to ambient light. If there is not enough light, such as at night, just press the + or - button to activate battery power. Now it will operate like a regular red dot. You can adjust the intensity by pressing + or - buttons. When it is time to power off the unit, just press both buttons at the same time or simply put it away and it will turn off battery operation after 8 hours. The unit is now automatically in solar powered mode, ready when you need it. You can verify the power mode by covering the solar cell. If the red dot is on, you are in battery mode. If it is off, you are in solar mode.

  • Designed for day use and night vision
  • New advantage technology LED  allows 50,000 hours of operation on one battery
  • 2 MOA on dot size
  • Reduced training time and ammunition
  • Unlimited field of view
  • Parallax-free with unlimited eye relief
  • Unaffected by extreme weather conditions
  • Low mount and 1/3 Co-witness mount included
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Battery Life600 Hours
Battery TypeCR2032 3V Lithium Coin
Click Value1/2 MOA
FinishHardcoat Anodized
MaterialAluminum - 6061-T6
Night Vision CompatibleNon-Compatible
Reticle2 MOA Dot
Reticle ColorRed
Warrantylimited lifetime
Weight4.37 Oz

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see www.p65warnings.ca.gov

Excellent Quality Not


After 3 months and only having 20 sight in rounds shot with it, the LED is failing. I thought it was the solar cell but after a weekand 4 new different batteries, I need to turn on the dot to max brightness to be useful. I've called Holosun numerous times leaving voicemails. I regret not buying the Primary Arms MD-ADS. Don't go Holosun, they're not willing to back their products. If they were, I wouldn't be writing a complaint. Nor wasting phone minutes calling and calling...

5 Star Red Dot Sight!


Amazing product, I am so happy with my purchase. Dot sight is perfectly waterproof, I have tested it several times and it does not fog. Very durable finish, very crisp, 2 MOA dot. Easy to dial in and zero. Solar feature works like a charm! I never use battery power when I am outside, or even when I am inside a lot of the time. I would recommend this to anyone looking to put an aimpoint style optic on their rifle.ONE THING TO NOTE. If you want to cowitness your ironsights, I bought the american defense lower 1/3 cowitness quick detach mount... Awesome mount, but it is too high for me to see my irons at all through it. I am running Magpul MBUS pros on my rifle. I would recommend the absolute cowitness american defense mount.



Best purchase! Love this red dot

Awesome features


Bought for the light weight, long battery life, and ease of use. Couldn't be happier with the results. It can be a little hard to initially pick up the dot depending on the background but can easily be changed if needed. Look forward to seeing the circle dot on the 503 as it may be even better.

Have 4 Holosun sights


I have 2 403C and 2 403G, love them all. Great sight have taken a pretty good beating and still keep on ticking

Holosun red dot


I have a PA reddot on my Buckmark...fantastic. I would have gotten the next gen but the Solar Power interested me. Pretty neat bit of kit. It's currently on my 5.45 AR and is working perfectly. FYI it comes with two different risers

Very nice!


I have always wanted a red dot sight that could operate without batteries but they were always out of my price range. But now I have it. This sight is well crafted and the dot is clear. It started working without the battery upon removing it from the box. The dot was visible in my house midday with only the light coming in through the window. It will even work outside in the shade.

Probably better than my old vortex sparc..


I have yet to drop it, banged around to see how it holds up. The glass is clear and the dot is crisp as stated. So far I really like it.

unique setup not available anywhere else.


I really like this red dot. Its awesome that the dot will adjust brightness based upon the ambient light. And when it gets dark it just switches to battery, seamlessly. Its nearly perfect.

Holosun Solar


Initially a nice sight but the solar option seems to be funny. It says when not enough ambient light is auto switches to battery mode. Mine did not had to do it manually. Tried contacting Holosun but no reply back. Works fine on battery mode but thats why i bought the solar.

Done with aimpoints.


I've wanted a battery independent, rugged, unobtrusive, affordable reflex sight for yeats. Thank you for Nailing it on the head. With an American Defense H1 mount, this combo can be mounted as low or high as you need. I wish the knob caps were tethered and had directional click arrows but once zeroed, you'll rarely need to touch them again. Primary Arms quality is right up there with Trijicon and Aimpoint but without the ego. PA for all my builds from now on.

Great red dot!


Paired this red dot with an American defense mount and couldn't be happier. Great, affordable alternative to the T1/H1.

Holosun solar powered red dot


Sight was packaged well. pulled it out of the box and sure enough, it was ON. There is a small tool to loosen the tiny screws locking the battery tray, and an Extra battery tray... Nice. Tried it out last week-end. Dot was bright enough outside in the sunlight. Ground was covered in snow so I had to use the battery Inside, shooting Out into the sunlit snow. Had no problem seeing the dot. Crisp dot, clear glass, and it seems to be parallax free. Very pleased.

great sight


We are very surprised how much I like this red dot. It can take a beating. And we LOVE how its always on during the daylight and room light. A+

Occasionally Requires A Hard Reboot


Occasionally the unit fails to respond to user input and requires a hard reboot (remove the battery & reinstall after a few seconds)

Love it ...except!


I love this site for its value functionality the solar power everything works great it functions perfect. But the only problem I have with it is mine has a red glare coming across the glass but otherwise perfect.