Will this cowitness with my a2 front post? I don't mean a lower 3rd cowitness

No, not with the mount the optic ships with. It is compatible with Aimpoint T1 mounts, so full cowitness it definitely possible.

Does this include the high rise mount AND a low base?

The HS403B comes with a high mount (lower 1/3 co-witness on standard AR sights) and a low mount.We are an AUTHORIZED distributor and the above answer came directly from HOLOSUN USA . Hope that helps !

Does this pair with the holoson hm3x magnifier? any special parts or spacers needed?

It should, but you can always call holosun... it’s free.

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HOLOSUN HE403B-GR / HS403B 2 MOA Dot Micro Sight for Rifles - Shake-Awake Super LED Durable Waterproof Aluminum Sight with Multilayer Reflective Glass & 12 Brightness Settings - Red/Green Dot Options

Product ID: 28163104

Details

Brand
HOLOSUN
Color
Black
Compatible Devices
Rifle
Item Weight
4.32 ounces
Magnification Maximum
1 x
Magnification Minimum
1 x

🌈12 brightness settings

💧Waterproof & rugged aluminum

🔋50,000 hrs battery life

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€ 337.17

Duties & taxes included

In stock

Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Lock on fast, shoot sharp, and never miss the moment.

UNMATCHED ENDURANCE - Ultra-efficient Super LED powers up to 50,000 hours—stay ready for years without a battery swap.
CRYSTAL CLEAR VISION - Multilayer reflective glass delivers glare-free, razor-sharp reticle clarity in any light condition.
INSTANT ON SHAKE AWAKE - Auto-activates with the slightest movement—never miss a shot waiting for your sight to power up.
PRECISION FIT VERSATILITY - 6061 aluminum housing with dual mounts for perfect co-witness or low-profile setups on any rifle.
TAILORED BRIGHTNESS CONTROL - 12 reticle intensity levels including night vision modes—customize your sight picture for every environment.

The HOLOSUN HE403B-GR is a cutting-edge 20mm micro red dot sight engineered for rifles and carbines, featuring a durable 6061 aluminum body, industry-leading 50,000-hour battery life powered by Super LED technology, and Shake Awake auto-on functionality. Its multilayer reflective glass ensures maximum light transmission and minimal glare, while 12 brightness settings—including night vision modes—offer unparalleled adaptability. Designed for professional shooters and tactical enthusiasts, this optic combines rugged reliability with precision aiming in a compact, lightweight package.

Specifications

ASIN	B01BJ3ZXD0
Aiming Scope Sight Pin Size	2 Inches
Best Sellers Rank	#71,698 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #188 in Gun Sights
Brand Name	HOLOSUN
Color	Black
Compatible Devices	Rifle
Customer Reviews	4.7 4.7 out of 5 stars (1,489)
EU Spare Part Availability Duration	10 Years
Global Trade Identification Number	00760921087428
Included Components	Product
Item Display Weight	0.9 Pounds
Item Type Name	Holster
Item Weight	4.32 ounces
Magnification Maximum	1 x
Magnification Minimum	1 x
Manufacturer	Holosun
Manufacturer Part Number	HS403B
Material Type	Aluminum
Model Name	HS403B
Model Number	HS403B
Mounting Type	Picatinny Mount
Night vision	Yes
Objective Lens Diameter	20 Millimeters
Product Style	Red 2 MOA Dot
Reticle Type	Single Dot
Sport Type	Hunting
UPC	760921087428
Warranty Description	2 Year Manufacturer

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