Here l have for you a good quality airsoft Red dot with a real steel l Daniel Defense mount. The aluminium mount had steel inserts in the screw area that connects to the rail and markings on the bottom plate. 

The red dot has 12 intensities, and very good transparency. I don't know the brand of the red dot but l can say has a good quality as l can compare with my Primary Arms and Vortex dots. 

Price is P&P