Around the first of this year, I ordered a .357SIG barrel for my G22. It took about 5-6 weeks for the new bbl. to be sent to me. It was well worth the wait, however, as the accuracy of my .357SIG reloads using the G31 bbl. is/was outstanding.
As a footnote, the people at Glock, Inc. (Smyrna, GA) did NOT seem to want to help me all that much. The people I spoke with there seemed almost burnt out. (I needed to call CZ-USA out in Kansas City, KS, a few years back, and got to actually talk to their chief gunsmith, several times, which impressed me a lot).
AK