How can I find the color of an object by looking at it?

I have really just started using BP and am hopelessly lost. I have tried using line trace but have not figured out how to get my linear color from the object.

It might help to know the end goal. I’m trying to have a character look at an object, press a button, be able to get a color from that object and store that color to use. For now, just to show I have it working, I’m trying to get my projectile (from the starter content in the first person shooter) to turn whatever color I have ‘stored’. I’m not trying to have someone else do work for me but I have no idea where to go from here and any kick in the right direction would be very much appreciated.

From the hit result, you can get face index and material from that. Notice how the gun change color ( top vid ):

I think it’s detailed here: