I have 5 total mags with my new gun, I'm taking a class in a few weeks and they say you should have 3 double or 5 single stack mags.
I wouldn't have bought that many if it wasn't for the class, but you guys are making a lot of good points, I may order a few more now
I don't want to just mindlessly blast through ammo at the range, so having to reload is a good way to slow down some and really focus.