Yes, you can put a red dot on a 1911. A gunsmith mills the slide to the optic's footprint, and Fusion cuts 1911 and 2011 slides for red dots. This guide explains what an RMR cut is, how slide milling actually works (rough cut, slide taper, fitting the optic), and when to mill directly to a footprint, use an optic plate, or buy an optics-ready slide.
