I'm interested in buying an extra barrel in .357 SIG for my Glock 27 (.40 S&W). I understand these two barrels can be interchanged, hence it seems I'd almost be getting two guns (.40 and .357) for the price of one. However, I saw the following posted somewhere and was wondering if there was any truth to it: "When Glock introduced the .357 Sig several years ago, I tried one out and purchased one for my duty weapon. The dealer at the supply store told me that Glock had tried a conversion to convert .40 S&W Glocks to .357 Sig and that there was a problem with the .357 Sig round wrecking the .40 frames after not very many rounds. Thus, Glock beefed up the frames on the .357 Sigs in order to correct this problem, and thus did not recommend converting any Glock .40 to .357. I don't know how true this is, but it's food for thought." I don't want to damage my Glock 27 at all, so I thought I'd see what you all had to say before I shelled out the money for the extra barrel.