No, there's not a lot of information about the SBR100. Tesro are a small company, and I believe they only make the SBR100 in small numbers.
The action is short, and looks nice and easy to load. It looks a little like Walther designs, which isn't surprising as the guys behind Tesro once worked for Walther. It's actually a few years older than the KK500. I've heard Tesro fit Lothar Wallther barrels.
As for which other makes fit, I've seen Anschutz and Diana actions in Tesro stocks.