These. Esp the bolded ones. The only caveat I'd mention, is the .357sig barrel pressures are slightly higher than .40S&W and sometimes come with a heavier duty return spring. So, I got a .357sig and then an additional .40S&W barrel, as opposed to getting a .40 and then a .357sig barrel - so it would have internal components built to .357sig specs. The magazines are identical for .357sig and .40S&W so you don't need any additional components there, just a barrel. That whole issue above probably isn't a big deal unless you're putting thousands of rounds through it, but I erred on the side of robustness.