You may have a wait for the .22's, minor glitch at the factory. They ran out of the right pellets for testing and the inspector has to wait for them to arrive. Wait will be around two months or so I think...
ST77, you could get a .22 B28 and have what you want. If the power isn't the same just swap the BBL to the RAM and see if there is a difference. Stephan Archer is selling XS-28 (B28) for 149 new http://www.@#$%^.com/Xisico-XS28M-Air-Rifle-p/xisicoxs28.htm or you can wait to see if the RAM makes it to .22 cal, or buy a BBL from Mike Melick.
Dmike,One thing I gotta ask, did you work on that stock yourself? That does NOT look like an ordinary stock, even the 350 stock. Nice looking setup, just doesnt look like you simply chopped the bbl and threw a stock on, that looks refinished.God bless,Farmer