Just found this site and after seeing it, I wish I had bought 10 M357's. Did not know I had one of the rarer models out there. Enjoy shooting it though and bought it about a year ago as part of a package deal. Local gun shop had it with spare magazine (12 rounds), DeSantis holster and magazine carrier all for a pretty good price. Could not pass it up and had the choice of .40 cal or .357 SIG. Got the .357 since it was sitting there the longest so the dealer wanted to get it sold. Took some money off the price and threw in an extra couple magazines. Have 5 magazines that say M357 on them. Nice to know .40 cal ones work as well though. Will lay in some of these too. Thank you all for the great info. Will buy up a .40cal if I find one. So far no mechanical issues and have put about 1000 rounds through it.