How Do I Get This Collision Component

How Do I Get This Collision Component?

In my projectile class I create a Collision Component that is based off of the UCapsuleComponent:

    CollisionComp = ObjectInitializer.CreateDefaultSubobject(this, TEXT("Collision"));
    CollisionComp->OnComponentHit.AddDynamic(this, &AMyProjectile::OnHit);
    RootComponent = CollisionComp;

I would rather use the collision component that is already created in the BP editor but I don’t know how to get it. Does anyone know how to access the collision component in C++?

Also, should Collision → Customized Collision be checked?

Should I add my own collision handling function to the component, as done above (::OnHit), or should I have ::ReceiveHit()? What is the recommended way of handling this?

Thank you.