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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?
 

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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....
 

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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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