Good memory, Brent. I built the Paraordnance .45 myself and have the receipts for at least the receiver and slide, but I don't know if those would work in place of the 4457. I would like to bring it back when I finally give up my life in Kenya because it is wonderfully accurate. It's high cap magazines are, of course, now illegal in California, unless the Supreme Court starts overturning our idiotic gun laws.
I do have a .470 that Butch Searcy built for me but will eventually sell that to a friend when I hang up the dart gun for good.