Very interesting post by redgoat on Remington 870 Forum:

This is more of a “here’s what I’ve observed” post than a how-to or an open ended question.

While researching all of the parts involved in the “flexi-tab conversion” for an older Wingmaster I learned that there is more involved than just switching the shell carrier to the new flexi-tab one. As I understand now, there can be up to four parts involved. I’ve listed them below along with their corresponding parts diagram number