Hey Jeff
There are bunch of Grumley guys here,(I'm not one of them)lol Its Turkey season so might be a little bit to hear from them.
The tips are called Syiahs (sp)I believe they were made to increase the speed of the arrow by snapping forward when shot. Someone will be along to correct me, but I think thats the basic idea.
That is a real beauty and a must be great for your buddy to have a Bear Grumley given by Fred himself.
Kurt