Red dot and 870 saddle mount

For sale is:

A RedHead Ascent 1x42 red dot sight mounted to a saddle optics mount off of a Remington 870. 

The mount has a shim that should allow it to fit 20 gauge receiver as well as a 12 gauge receiver. 

The red dot sight has 11 brightness settings. I verified it functions. A battery will not be included. 

$40 shipped, or possible face-to-face in the London, Ontario area.