Thanks bakerb! I just found out that all of the CZ 550 Safari Classics made in the CZ Custom shop in the U.S. (I ordered mine from the CZ Custom Shop and worked with Jason Morton who was great to work with!) have McGowen barrels.

http://www.bigbore.org/images/Big%20Bore%20Journal%2023%20LR.pdf

http://www.mcgowenbarrel.com/barrels.htm

Nice to know

Chuck