How to get specific collision and overlay it?

Hi
Sorry for the might be noob question.
So i have my Character blueprint, in it i want to get my character “weapon_l” collision which is on “weapon_l” bone and than check if it overlays with other actors than do stuff with them.

How do i select that specific collision and overlay it?

That Character blueprint already has animation blueprint to it and has the skeletal mesh and mesh already.