Some folks on the HK-L maillist report buying DAO variants at bargain basement prices, then getting the SA conversion parts from HK for $95 - it adds up to a considerable savings.
For information on the HK list, go to:
http://www.hkpro.com/hkpro-l.htm
It's a very low-traffic list, tightly moderated to keep out the flamers and the jerks.
Ken Strayhorn
Hillsborough NC