I just got my 9MM barrel reamed and worked on by a gunsmith from Ohio who loves to convert calibers! Looks perfect and have yet to shoot but cycles just fine! I have this on my .40 S&W Rami! Sorry, but don't know how to post pics! Now I have the option of a.40 and .357 Sig that really love to shoot!
Yes, a 9MM barrel will fit a .40 caliber Rami! If you have both, try it. I used a 9MM barrel for the transformation. CZ custom does it if you check it out!