Hello all! I'm new to this site and new to IDPA, but hopefully a lot of you get to know me quickly. I just have a quick question as my first IDPA "practice" is tonight at a local gun club. This will be the first one I'm attending. The email I received said to bring 3 mag's however I only have the 2 that came with my gun and no chance of finding a 3rd anytime soon (M&P FS). My question is do I really need 3 for practice or even a match? How much of a hindrance will this be for me?