Currently I have a G22 in 40 S&W. I have never competed in GSSF, or any competition, and I would like to start now. I bought my pistol in 1992 so it doesn't have finger grooves and I prefer it not to have finger grooves. I want to shoot in the Production class in 9mm. What can I do to use my finer-grooveless frame, shoot 9mm, and compete in Production class? Can I use a conversion barrel or do I need to get a whole new upper?