Thanks to all for "the bumps".
This .22 upper offers two distinct advantages over the $300-$400 Bushy/DPMS/CZ uppers. If you're on a budget, and don't mind the 10 round mags and no full-auto capability, then they are the way to go. On the other hand, this custom made upper utilizes the Ciener conversion kit which allows for the use of 30 round magazines as well as have "sear trip" capability to run in full auto.
I have $625 invested in it (without the Ciener conversion kit), so $499 isn't a bad deal. Only the modified Ciener Bolt Carrrier (plate) is included with this upper, the rest of the Ciener "conversion kit" is not included.
It's starting to get harder to find dedicated .22 uppers for the Ciener conversion kit. Last thing I heard was Rick Kuehl was getting out of the business.