Hey all. new here so forgive any formatting mistakes.

Effectively I'm making up some stats for an animated suit of armour for a one-shot. looking at the medium animated object stats (MM pg.13) it has a +4 natural armour bonus. is that bonus given as a catch-all for ease of running, being superceded by the armour's bonus, or would you add both the armour & natural AC bonus as they come from different sources?

just curious how other DM's would rule this kind of thing.