Collision component ignoring environment meshes

[Astaraa]

I have a Box Collision on my character, representing a weapon, attached to Mesh.
It’s set to Overlap All.
Overlap triggers for blueprint actors, such as pickups, but nothing for environment meshes, such as walls.
Walls have simple collisions and are set to Block All.
I don’t understand why the collision box is not triggering when overlapping walls and other static meshes. Any idea why?

My goal is to make IK adjust so weapons don’t go through walls.

[Astaraa]

As an alternative I did a line trace, which is probably better anyway.

I’m recalling that for characters basic collision is limited to the capsule, which seems to include environment and other characters.