If I'm not mistaken, the prophecy and the shock are both MHS compatable. So you could buy a coupler from TCSS to make those into a staff. As for the liberator and a shock staff, the liberator is alot thinner than the shock or say, a redemption, so it would HAVE to be custom machined. I'll leave it up to the ultra guys to decide the price
Hope you get what you're looking for!