Taking your red dot from un-magnified to 3x power is easy. Just pull back on the sight and rotate to engage or disengage the optic.
The RRDM's steel is designed to split the difference between Absolute Co-witness and Lower 1/3 Co-witness Red Dot Sights. Simply use the adjustment caps to center your red dot reticle in your field of view.
The RRDM has a steel mount and a rubber over-molding to prevent your optic from losing zero, even with rough handling and adverse conditions.