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.

Hs403b | Desertcart UK

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Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Lock on, level up, and never miss your mark.

UNMATCHED ENDURANCE - 50,000-hour battery life with Shake Awake tech means your sight is always mission-ready without the hassle of constant charging.
PRECISION AT A GLANCE - Dual reticle system with a 2 MOA dot and 65 MOA circle offers rapid target acquisition and pinpoint accuracy for every shot.
QUICK DETACH CONVENIENCE - QD mount and side-access battery tray let you swap and maintain your sight effortlessly, keeping you in the action.
ADAPTIVE BRIGHTNESS MASTERY - 12 brightness levels plus Solar Failsafe auto-adjust reticle intensity for flawless visibility from dawn to dusk.
BUILT TO BRAVE THE ELEMENTS - Titanium housing combined with waterproof and dustproof design ensures durability in the harshest environments.

The HOLOSUN HE403B-GR is a rugged, titanium-built micro red/green dot sight designed for rifles, featuring a dual reticle system (2 MOA dot & 65 MOA circle), 50,000-hour battery life with Shake Awake technology, 12 brightness settings including Solar Failsafe, and a waterproof, dustproof design. Its quick-detach mount and side battery access make it a top-tier optic for professionals demanding precision and reliability in any environment.

Specifications

ASIN	B07CZTXCM3
Best Sellers Rank	#172,381 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #399 in Gun Sights
Brand Name	HOLOSUN
Color	Black
Compatible Devices	Rifle
Customer Reviews	4.7 4.7 out of 5 stars (1,504)
Global Trade Identification Number	00605930624915
Included Components	Clear flip-up lens covers, Hi/Low QD mount included, Kill flash
Item Display Weight	0.5 Pounds
Item Type Name	Holosun Green Dot
Item Weight	4 ounces
Lens Color	Green
Magnification Maximum	1 x
Magnification Minimum	1 x
Manufacturer	HOLOSUN
Manufacturer Part Number	HE515CT-GR
Material Type	Titanium
Model Name	HOLOSUN HE515CT-GR
Model Number	HE515CT-GR
Mounting Type	QD mount
Night vision	No
Objective Lens Diameter	20 Millimeters
Product Style	Green 2 MOA Dot & 65 MOA Circle
Reticle Type	Dual Reticle (2 MOA Dot & 65 MOA Circle)
Sport Type	Hunting
UPC	605930624915
Unit Count	1.0 Count
Warranty Description	Limited Lifetime

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