Does a P320 .40 to .357 sig conversion require anything other than a barrel swap?

I got a 40 conversion kit and a .357 barrel and wanted to make sure that was all I need. Specifically do I need a main spring for the 357? I know the mags are compatible.

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Posts: 10264 | Location: NC | Registered: May 17, 2003

Paten

probably a good thing
I don't have a cut

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If you look at all the individual parts for both calibers on SIGs website, the only one different is the barrel. Same slide, same recoil spring assembly and same magazine. Different barrel.

Posts: 3819 | Location: Tampa, FL | Registered: February 09, 2002

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USAFA71

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My P320 FS started as a 40S&W, and works just fine with the 357 Sig barrel.

A superior pilot is best defined as one who uses his superior judgment to avoid situations requiring the use of his superior skill.

Posts: 376 | Location: St. Louis, MO | Registered: June 15, 2003

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sigfreund

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I use 357 and 40 interchangeably in the proper P320 slide with nothing more than a barrel switch.

(If you mean the recoil spring, that's the same for both cartridges as well. Strictly speaking, the P320 does not have a main spring, which is usually considered to be another term for hammer spring.)

“ One may protest against evil; it can be exposed and, if need be, prevented by use of force. … Against stupidity we are defenseless. … [R]easons fall on deaf ears; facts that contradict one's prejudgment simply need not be believed … and when facts are irrefutable they are just pushed aside ….”
_{— Dietrich Bonhoeffer}

Posts: 50098 | Location: 10,160 Feet Above Sea Level in Commirado | Registered: April 04, 2002

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