Remington 870 Express Red Dot sight?

[Tjamesd]

I have a Remington 870 Express used for slug deer hunting. Any recommendations on a Red Dot sight to use with the 870 Express?
Also, any reliable saddle mounts to use as well?

Appreciate any input.

[Losoutypery]

For a red dot, look at the Vortex Venom or the Burris Fastfire 3.
For a saddle mount, the TacStar or Mesa Tactical options are solid and hold zero well.