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Though I haven't done it, I understand you can convert it to 9mm with a complete slide, barrel and magazine change.

The SIG SAUER Classic .22's are built on the same frame as their centerfire counterparts. So yes, definitely.

Using a SIG SAUER Caliber X-Change Kit, the P226-22 is convertible to 9mm, .357SIG, or .40S&W. https://www.sigsauer.com/store/p226-22-nitron-full-size.html