Hello, I have a question regarding the Sig P229 SAS in 9mm. Now I know there are conversion kits for the Sig, allowing it to be swapped from 9mm to 22LR. and like the .40, you can swap it into 9mm by changing the barrel and mag out. now is it possible to do it the opposite way? can i convert my 9mm into a .40 by getting the barrel and a mag? just a question out of curiosity.