I got it. I shot it. I liked it well enough to order a 9MM top end "kit" for it. I also ordered 2 P09 9MM magazines for it.
I've ordered 3 P07 .40 S&W magazines and got them a week ago.
Today I ordered a 9MM P07 magazine.
I got to thinking maybe, to go along with the 9MM top end I should have a dedicated (to it) slide stop. So I ordered one of them. I got to thinking that the barrels might be different enough to accelerate wear on the slide stop if I switched back and forth between the 9MM and .40 S&W.
Now, give me a couple/three months to pay off the credit card a little and then I plan to order a 9MM barrel and see if I can get it rechambered to .357 SIG (I have lots of .357 SIG ammo loaded up for the other guns the P07 is convincing me to stop shooting and sell.
I did noticed one difference between the 9MM and .40 S&W recoil springs/guide rods/slides. The 9MM unit does not have a "captured" spring and the hole in the end of the slide is too small to allow me to replace it with one. I'm supposing the captured spring modification is a later one and that slide/barrel/etc. is an older unit.
Anyway, I got the slide "kit" but no magazines, yet. If I get the magazines I may have to go shooting this weekend to see how the P07 does with all that 9MM ammo I have loaded up (147 grain lead, 147 grain HP, 124 grain HP).
Now, off to move the washer/dryer so we have a place to put the new washer and dryer. This "fun" went south real quick, didn't it.