Ismael, it is not cut for a Red Dot Optic however, you could replace the rear sight with a Dovetail Red Dot Mount : mountsplus.com/egw-vortex-venom-1911-novak-mount.html

You can replace the rear sight with a novak dovetail to red dot adapter or you can get one that attaches to the rail.

As James said this is not cut to accept an optic. Your only choice to add one is to buy a dovetail red dot mounting plate. It's a little plate that takes the place of your rear sight. This looks to have Novak cut sights so you would need a Novak style red dot mounting plate. Hope this helps.