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I've bought SIG barrels before and most just drop in so this will probably do it. https://www.sigsauer.com/store/checkout/cart/

yes it can with just a barrel as the 40 and .357 sig use the same magazine

John, yes Sir. Same deal, Since the 357 Sig is a 40 S&W Case necked down to 9mm, only a barrel change is required. I would also recommend a 2 to 4lb heavier recoil spring to handle the extra power of the 40S&W recoil. Same magazine used too.