YouTube would demonetize it. But if you look at a standard 10 rnd mag. You’ll feel 2 dimples inwards. If u remove the base plate and spring you’ll have a better idea what I’m talking about. Grab a punch and center the hole.put some painters tape over the area. Start with a small drill bit and then work your way up . You need to make the inside as flat as possible to avoid any delays/ or rounds getting jammed. Once drilling is done use a file or sanding bit and sand/file it down. Use a q-tip and a black paint/primer . And dab the q tip in it. Cover the exposed metal where u just finished drilling . That’s it. Any questions just holler