Be advised that a Sig Sauer P225 A1 is an all new model capitalizing on the cult popularity. It has nothing in common with the original P225/P6 but the bare similarity of a single stack 9mm. No parts interchangeability.
This may be a good thing, my stock commercial P225 has a notably tough DA, even in comparison with other Sig Sauers.
Also they have presumably fixed the magazine peculiarities of the P225/P6 series, probably along the same lines as the P239.
Apropo which, I think a good stockmaker could make a P239 feel like a P225, it has such a skinny butt that you could shape almost anything around it.