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yes you can all you need is the Barrel the mags will work just fine

yes you can barrel swap and mag

Hey Edgar, Yes you can change the barrel from .40 to .357 sig. It is just a barrel swap. Same mags. Hope that helps!

Yes you can Edgar. This will be just a barrel change and usage of the same magazine since the 257Sig is based off of the 40S&W cartridge necked down to 9mm bullet.

Yes you can Edgar. This will be just a barrel change and usage of the same magazine since the 257Sig is based off of the 40S&W cartridge necked down to 9mm bullet.