Scrounger, I'm pretty sure you could get just about any of the rifles, not shotguns,and have a barrel fitted to it, so Im pretty sure you can get a 30-30 barrel for it, somebody correct me if im wrong, im pretty sure you can order replacement stocks for the 30-30 if you bought it and took the wood ones off, then you could either keep those or do whatever with them and order synethics from the factory, im not sure about the .357 barrel (someone else will prb know), and I think in previous posts there were people talking about the 7.62 barrel, I don't think it has been out yet, I'm not 100% sure about this so please don't get mad if im wrong, but i think they are in production, and i thought it was only a barrel right now and you couldn't purchase a 7.62 gun, but correct me if im wrong, i was just trying to remember what was posted in previous posts...hopefully someone can awnser your .357 ?, and i hope i awnsered the ?'s you were looking for...MIdeerhunter