Mesh Collision Shapes

Hi, I’ve got something very basic here.

I just want to fit one or more collision shapes to the mesh of a weapon (inside a blueprint), but I don’t know how to adjust the transform of the shapes.

The origin of the mesh has to fit with the socket of the character it is meant to be attached to. That means I can’t move the mesh to fit the shape(s).

I want the gun to be dropped and go physics-simulated on death. As far as I know, the physically simulated component has to be the root-component. That means I can’t move it either.

So how can I best do this?