Use acronym which are clearly mentioned in the parts list. If you go through any manual now, you will find terms mention which require some guessing.
I'll agree with all of threeshot points, I'll add also, clearly show how to remove the retaining pins, for example for the firing pin, during disassembly.
Also, I know they want to save money but put one manual for one gun. Right now, there's variance for North American, Europe, 12/20 guage, magazine extension, etc in the same manual. It's also not clear how to remove the rubber butt plate off the M1.