My reloader B will keep up to my guns when I was testing in the sub 30 bps range without needing any modifications. Besides, I could never physically get one of my guns to cycle faster than about 27 bps. That seemed to be a design limitation of the hardware, the circuit boards were definitely asking for faster but the gun just couldn't cycle fast enough.
So unless you want to build a multi-barrel gun, you really don't need this mod.