Since this has been an issue for several videos and took a bit of digging over a few days and I have finally found a solution I figured I would put it here in case it can help someone else.
I am currently in Unreal 4.18 and have had issues with “Barrel” being a “pointer to incomplete class type.” I could always compile but because of this I could not get the inteli sense to work with drop-downs and such.
Finally found my solution to be adding:
#include "Components/StaticMeshComponent.h"
No more Barrel squiggles and working drop-downs, hooray!
Thanks