Im a poor college student majoring in criminal justice (Im going to be a police officer) and I need some advice on Conversion barrels. I have one pistol in my small collection, A glock 33 in 357Sig. I want to try IDPA and also use 40 or 9mm for IDPA and just normal range days. I already have seven 40/357sig magazines so 40 would be better in that respect but 40 is also a bit more expensive than 9mm. What do you all think, go with 40 or 9mm? P.S. what conversion barrel would you suggest?