One of the great things about a custom gun stock is things like forearm depth, length of pull, cant, and cheekpiece height can all be built into the stock to fit you. However, for those that think adjustable hardware adds coolness factor, or if you think you need to adjust the fit of the stock for different shots during a competition, below is a collection of hardware I found through an hour of Googling. I don't necessarily recommend, or have used, any of these. If you find additional items please send me the link and I'll add it to this reference. Installation of hardware performed at hourly shop rate.
Adjustable Cheekpiece Hardware: