To me, it just looks like a stock Carvin bridge and they just removed the lock screws and slid the saddles further apart, since they are on a rail. That string distance would make raking and popping a lot easier. (Not that I would do raking and popping on a fretless, but who knows.). That one screw sticking out, I would bet they accidentally sheared off the screw and couldn't get it out. You can see the damage to the black plate just on this stock model.