Matt, that is sweet. It's sad, though. I was originally going to be producing them with jack from Q project, but we couldn't source the parts affordably enough. I have a local guy who offers awesome prices but can't get the items in stock.
The pictures on that site, by the way, have the actual HK furniture on the gun. Those are not castings. Still, can't wati to see them out and about. The carry handle is pretty nice once you have the gun in your arms, too. The sights look straight through, it offers stable and comfortable carry, and again, it's dead sexy.
Nice link, pal!