Oogee,
Composites are strong, but not hard. That's why they are used for load bearing, not friction bearing surfaces. Metal is still the most useful material for a number of things. A steel bicycle frame need only be 15% heavier than a composite one, and will last longer, for instance.
You might be able to make a ceramic barrel. There are ceramic jet turbines, after all. But there isn't going to be a reason to make a ceramic Glock, or any other gun that takes conventional cartridges. Any special Xray proof weapon is going to have to be designed from the ground up, including the ammo.
There is no special Glock.