I installed a Jackash rod right after I got the gun. I removed the captured spring from the factory original and use it uncaptured with the new rod. It takes a little finesse to get it reinstalled, but it's not impossible.
The rod is high quality and has performed flawlessly.
12Volt does the work as a side business...he has a "day job". Don't be surprised if he's a bit slow on returning your email. He's also recovering from a recent injury, so I think his guide rod work got a little backed up. If you want a rod, I'd go ahead and place an order -- he'll get it turned out as quickly as he can -- and you'll be very happy with it!
Jim