Using mouse events in first person

I want to make it so that when someone clicks a block it dissapears, but in the first person template with the cross in the center, it doesn’t work.

I’ve been trying to solve this all day, for something so common there should be an easier way of doing things…

Try with linetracing like this: http://imgur.com/a/t3T1j I haven’t included the blueprint that changes the material for the sake of simplicity.