Bo-Mar Cut Milling timelapse.
This video demonstrates the advanced gunsmithing process of milling a Bo-Mar cut into a 1911 slide to accommodate an adjustable rear sight. The expert instructor guides viewers through the precise CNC machining steps, including initial channel milling, deepening the profile, drilling mounting holes, refining the sight base, and finally tapping the threads for screw installation. The demonstration highlights the use of various cutting tools and the importance of coolant for a clean, accurate modification.









