Apologies if this has been answered in the past, I couldn't find anything regarding it.
The Automaton Ancestry Feat
Your mechanical body houses a weapon or shield that you can quickly draw and stow, leaving you prepared for combat at all times.
You can use a 1-minute activity, which has the manipulate trait, to integrate a single, one-handed weapon or shield into one of your arms. You can draw or stow this item as an Interact action. Creatures don't automatically see this integrated item when it's stowed and must actively Seek in order to find it. They take a –2 circumstance penalty to any checks to do so.
As I'm reading it other than basically hiding the weapon within the body of an Automaton it really serves no other purpose. Can anyone give me anything that would make this feat more worthwhile, I would have seen value in it if drawing the weapon was changed to a free action but as it currently stands its just a way to make it a concealed weapon.