Ok, someone school me! I have just purchased a 5" 9L as far as I know the 9L only comes in a 5". Anyway I am trying to tune this pistol, to run on my loads that I run in my XDm. While trying to find a replacement spring, I have noticed that most sites specify springs to a certain barrel length. I've found springs for barrel's 4.25", 4.50" and 4.75", I even found a site that claimed their springs with fit any 9mm M&P. What the hell am I missing? OK let the hazing begin! Thanks in advance