I have a Chapman kit, the little red box, but it is of limited use as it has nothing for narrow slots. I went to Brownells to get the 3 Apex type bits made for S&W revolvers, thereafter I eventually got one of their big kits. Well it is not all of the possible bits. It is sort of intermediate as it skips some sizes but is vastly more useful than the Chapman kit. Has all different widths and blade thicknesses for those narrow slots that you better fit right. While you are at it with Brownells you might get a kit of punches for round head pins and the ones for hollow roll type pins, those are quite useful sometimes. Buggered up pins can be as bad as a buggered screw head.
Your gun is like your nose, it is just wrong for someone else to pick it for you!