[Closed] getting attach prop offsets

I’m working on a game engine weapon/prop attachment scheme,
I need to extract the offset pos and rotation of a weapon prop form its parent joint in a skeleton.

can it really be this simple?

offset_pos=$attachment_01.pos-$attachment_01.parent.pos
offset_rotation= $attachment_01.rotation-$attachment_01.parent.rotation

seems too easy…am I over looking something?