Hello to everyone! I'm new here and stumbling my way around. I own a MP40c and a MP 9mm FS (5") PORTED. I have tried finding this subject unsuccessfully. Would like to hear thoughts, ideas or comments concerning using a 9mm Wilson barrel in my 40c? It works great and is as accurate or better than the stock barrel. Second question; does anyone know exactly what are the differences between the ported barrel MPs and the regular MPs. Would an Apex upgrade actually be an upgrade? Thanks for your help!