The problem is that once you start customizing a gun, the manufacturer and your expectations for their involvement are out of the picture. I wouldn't change anything, until you have shot the heck out of the gun and are sure it will be a good platform for customizing, while accepting that you will then be on your own. That said, I sold all but two S&Ws, and one of them, a $1000 Performance Center, is down for light strikes and will go back, but hopefully they won't notice that the forcing cone was recut (was off axis), and the throats were opened up.