I'm looking to replace the front sight only on my SW MP9 Compact with a fiber optic front sight but a dot about the same size as the white dot on the front sight.

I don't mind the rear sight just want a big fiber dot on the front.  I've been looking but if anyone has done this?  Which sight did you use that will work with the existing rear sight?  Thanks for looking.

The best: Dawson Precision

The easiest: HIVIS on Amazon

I put Hiviz lite wave on my Shield 45, both front and rear.   They were easy.   I am not sure if the front co-witness the factory rear or not.  

I put TRUGLO Tritium on my M&P 45 full size.  They were not as easy as the hiviz.  The front required a lot of fitting, to the point I was sure I had the wrong front sight.  

My eyes can pick up the Hiviz fiber optic easier than the TRUGLO Tritium in daylight.  Looking how cheap the Hiviz sights are now I may have to swap out the TRUGLO Tritium.

I have TRUGLO TFO"s on three pistols and very pleased with them.
Combo of fiber optic & tritium.
Best of both worlds.

I have become a fan of Night Fision. You can buy only the front.