Most times, G-10 is checkered for better grip. It's not supposed to be slick and shiny, it's supposed to be durable and grippy. That's why it comes to you out of the box like that. If you do happen to have some slick G-10, and aren't concerned with it being grippy, it should buff out pretty shiny with the right compound. I've seen a pink compound that works like magic on every handle material that I've seen. I believe it is made for buffing wood handles.