Here are 3 best red dot sights for AR 15 with fixed front sight. The optic pairs well with these rifles to co-witness.

Whether the shooter hold up the front sight or fold it, these are great red dot sights to check out

Best Red Dot Sights For AR 15 with Fixed Front Sight

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Aimpoint Micro - Best Durability

DD MK18 with Aimpoint Micro H1

Aimpoint Micro is the most rugged red dot sight built with high strength to weight ratio 7075 T6 aluminum housing against hard anodized surface. Aimpoint Micro has a reputation for ultimate reliability for law enforcement and military use. 

Small and Compact - The optic is super lightweight and it's dependable for any AR15 builds

Waterproof - Fully sealed optic with IPX7 rated housing unit to withstand rainy and muddy conditions

Multiple Brightness Settings - 8 day light settings and 4 NV compatible settings

Shock Proof - The optic retains zero during full auto fire and lets the user shoot accurately

EOTECH EXPS3 - Best Holographic Sight

eotech exps3 68 moa ring

EOTech offers a large window even if the AR15 features a fixed front sight for co-witness. With the use of a magnifier, the shooter can easily target ID things far away without having the fixed front sight obscuring the POV.

Shoot With Both Eyes Open - Not miss anything in the corner of your eye with both eyes open while looking through a large window

Unobstructed FOV - Easily acquire the target while shooting on the move, shooting over barricade and around corners.

CQB Holdover - Use the bottom of the 68 MOA ring for fast close range holdover to compensate sight over bore offset.

Optimized Cheek Height - Built in 1/3 co-witness mount height for the shooter cheek weld more comfortablely without pressing cheek into the stock. Raised optic height doesn't interfere with fix front sight post.

Read Detailed EXPS3 Review Here

Aimpoint Patrol - Best For The Money

Aimpoint patrol red dot sight field of view
The Aimpoint Pro (Mount Included) is by far the best 30mm carbine red dot sights on the market under $480.
This is a classic civilian version of the mil spec Aimpoint Comp optic used many standard M16 and M4 rifles with fixed front sight post even though its field of view isn't as good as other large window optics.

Precise Aiming Reticle - Engage targets up to 200 yards with a fast to pick up 2 MOA dot 

Always Ready & Always On - It's always on without fumbling with brightness dial before use. 

Even Survives Fire - Survives any hash combat environment like an "T-800" terminator to keep the sight running.

See Through Flip Covers - No fumbling ! Engage through the closed lens cover in an emergency situation.