Replaced the factory installed front sight with a high-viz front sight that I ordered directly from Ruger. Replaced the Houge grips with Altamont grips. The grip panels are made of "bonded ivory" which I ordered as well. Altamont is one of a few companies that makes the original rubber grips that Ruger used to put on the GP100. The older style grips fit my hands better and I just like the look of them.