Go to the BP_MasterRangeWeapon and create a new function called Set Aimed Focus. Then copy the image below, make sure you set the Trace Channel input to Weapon on the LineTraceByChannel node.
Then go to the location shown below and add the new function like the image shows, location at the top of the screenshot.
Then go to the location shown below and change you current code to what the image below shows. Location at the top of the screenshot.