Holosun Micro 2 MOA Red Dot Sight with Shake Awake - HS403B

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Holosun Micro 2 MOA Red Dot Sight with Shake Awake - HS403B


Quick Overview

SKU: 52661
UPC: 760921087428
MFR#: HS403B
  • Light Source: LED
  • Reticle: 2MOA Dot &amp
  • Parallax Free: Yes
  • Unlimited Eye Relief: Yes
  • Magnification: 1x
  • Battery Type: CR2032 (sold separately) 
  • Battery Life: Up to 50,000 hrs
  • Brightness Settings: 10 Day & 2 Night Vision compatible
  • Housing Material: 6061 Aluminum with Titanium Hood
  • Adjustment per click: 0.5MOA
  • Height: 1.63 In
  • Weight: 4.3 oz

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The 403B is a small compact micro red dot optic. Employing Holosun’s 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.

  • Designed for day and night use
  • New advanced technology LED allows up to 50,000 hours of operation on one CR2032 battery (sold separately) 
  • 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
  • Durable and reliable construction
  • Low mount and 1/3 Co-witness mount included


Shop Palmetto State Armory for the widest variety and best selection of optics!

SKU: 52661
SKU 52661
Brand Holosun
Department Knives Optics Flashlights
Daily Deal No
Daily Deal Expires No
Unit Price No
Youtube Video No
Free Shipping? No
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 52661

Questions and Answers

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Browse 20 questions Browse 20 questions and 63 answers
Is this a sig Romeo5 knock off?
James C on Mar 24, 2020
BEST ANSWER: Consider this rds, sigs romeo 5, and Primary Arms advanced micro dot all brothers. Holo and PA are from the same factory and Sig is likely to be also. Owning all, sig and holo have shake to wake, PA doesnt but has 5 year life without turning it off. They all feel and operate the same with the dot and brightness having no difference.
Get which saves you money and makes you feel all fuzzy inside.
Is this made in China or USA?
Dudski on Apr 16, 2020
BEST ANSWER: im sure if it was made in america it would proudly say so somewhere.
I have a Mossberg 930 Tactical with a 1913 Rail. I’m looking for a red dot that will handle the recoil from a 12 gauge. Will this sight hold up to that?
Dustin C on May 12, 2018
BEST ANSWER: This would be a good question to ask at the Holosun website.
Does this have solar?
Eddie on Mar 21, 2019
BEST ANSWER: No, other models do but this model doesn’t. I’ve had mine over a year and still haven’t needed to change the battery with weekly use mostly and sometimes daily
Does this sight have a green dot option?
Allen on May 14, 2020
BEST ANSWER: no this sight is the earlier module its a red dot works great comes alive as soon as you grab your rifle turns off in a few minute after its down saves the battery good buy for the money
Can flip up sights be used with this sight?
Ken G on Jun 18, 2018
BEST ANSWER: The 1/3 mount will cause it to be right above the sights..buis will be seen on the lower 1/3 of optic view..if you want a perfect cowitness you need an absolute.
Mine came with no battery. Is that normal?
Charlie W on Jun 27, 2018
BEST ANSWER: This item does not come with batteries.
Does it come with a battery?
kyle E on Jun 18, 2018
BEST ANSWER: Unfortunately, those items are not shipping with batteries.
Does it comes with a low mount?
Yamil H on May 12, 2020
BEST ANSWER: Yes. Lower 1/3 high mount and low mount for shotguns an ak47.
The specs mentioned a 1/3 co-witness mount, does this mean i wont be able to see my BUS when they are flipped up?
Robbie on May 30, 2020
BEST ANSWER: No. It means your back up sights will appear in the lower 1/3rd of the optics window. Lower 1/3rd is a good set up. It keeps your head up a little more when getting a cheek wield and for people who have a fixed front sight post your red dot will sit over top of your front sight and cause less of an obstruction in the optics window.
Can this be flush mounted or is the rider it's on have to be used?
Jeff P on May 16, 2020
BEST ANSWER: Yes it comes with two risers the one pictured and a flush mount.
What makes this HS 403B different from HS 403GL?
Jaime on Dec 14, 2018
BEST ANSWER: Green dot
I wear bifocal glasses, and found the Romeo red dot would "sun burst" when looking through. Has anyone had any issues with this model??
Pill h on May 28, 2020
BEST ANSWER: That effect you are talking about will follow you with every red dot (at least in experience as I have the same issue). I moved to 1-6x24 SFP scopes for the most part and I am happier.

With all that said, it is a decent RDS. I do prefer my SIG Romeo 5 over this RDS since the Shake Awake feature on the SIG is far more reliable at this price/quality point.
Is this dot waterproof?
William D on May 14, 2020
BEST ANSWER: Box says it is, I haven’t got it submerged thoughEnter an answer to this question.
Do you have to remove the optic from the mount to install the battery?
Phil150 on May 10, 2020
Will this co witness the factory irons on a cz scorpion with the low mount?
James O on Apr 21, 2020
BEST ANSWER: yes, this is the exact set up that I'm running.
Does this come with a quick-release base? I want to place a red dot on a KelTec sub2000, The red dot needs to have a quick release so that I can still use the folding function of the rifle.
Mark B on Feb 9, 2020
BEST ANSWER: These come with mounts with a crossbolt, not a quick detach. Any Aimpoint Micro pattern mount will work with these, so you can have any mount type you want for it. Midwest industries makes a mount specifically for the Sub-2000 that swings out of the way though, meaning the sight can stay on at all times, if you don't mind the extra bill for it.
What type or height mount should be used with this when equipping it to a tavor?
Lek15 on Nov 21, 2018
BEST ANSWER: Would depend on the height of the sights on the tavor and one's preference of "lower 1/3" co-witness or absolute co-witness.
Will this fit on a Springfield Armory Hellcat OPS?
William O on Jun 1, 2020
Will this fit a A.R.M.S. #17 QD?
Reuben H on Apr 19, 2020


4.7 / 5.0
63 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Worked with my astigmatism
Great product worth the money. It’s my first actual red sight that worked with my astigmatism so that’s great. Works wonderful all the way up to 200-300 yards, never tried it past that. So far so good
June 3, 2020
2 months ago
Great sight want to replace my larger profile sights with more of these.
June 2, 2020
2 months ago
This makes a total of 6 of these that I have bought. They are rugged and do the job.
May 26, 2020
2 months ago
Perfect sight for a great price.
User submitted image
Added May 26, 2020
May 26, 2020
3 weeks ago
Have several different Red Dot Sights, this works as well as sights I have paid nearly twice the price. Caught on great sale at PSA.
May 24, 2020
2 months ago
It works great. The shake awake is awesome.
May 23, 2020
2 months ago
Great little red dot
For the money, this little red dot is fantastic.
May 23, 2020
2 months ago
Best Budget Red Dot
Excellent optic. Very precise 2 moa dot. Outstanding battery life. Hands down best red dot for the money.
May 23, 2020
1 month ago
Affordable and reliable. The shake awake feature is great for acquiring a target quickly.
May 23, 2020
2 months ago
Holosun sight
Holosun red dot sights are great & dependable. The shake awake feature is my favorite.
May 20, 2020
2 months ago

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