I have a P320 compact chambered in 9mm. Am I able to just swap out the barrel with a 40s/w barrel? And if so, do I need to do anything with the recoil spring?
No. The larger barrel wont fit into the smaller slide. But smaller barrels WILL fit into larger slides. Whether or not you SHOULD shoot it that way is a different question....
40 and 357 Sig are interchangeable with just a barrel swap, but the recoil spring and barrel diameter on the 9 are both different from the other two calibers. At least per a conversation with a Sig person.
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