Does anyone know if the slide would need to have the ejection port opened up? The difference in the two cartridges is only ~1/8", but since I have never done this, it is the only question I am still a bit unsure of. Being able to reuse .40 brass would be nice since the brass availability that seems to be a crippling aspect of 10mm. Also, any thoughts of what would be an average going rate for a gunsmith to do this? If it is just opening up the chamber, I can do it myself. I have a small mill and lathe and am comfortable with that process. I just wouldn't be as comfortable on the slide/ejection system.