Article describing modifications to the A2 sight the author discovered after an Appleseed using a Revised Improved Battlesight Zero,
https://www.everydaymarksman.co/equipment/ribz-sight-setting/
Good post.
RIBZ makes a lot of sense for the A2 style rear sight. I set up my A2 this way about 15 years ago when the RIBZ first became a thing and prefer it.