Minimum 5 per gun, 10 per is ideal.
These answers I don't get. I don't understand where these numbers come from. I am going to say a sentence and if I am wrong and there is some obvious practical reason I admit my ignorance and limited experience but... having 10 magazines for a gun and you are simply a non-operator non-competition conceal carry citizen I think two or three magazines is enough. Is it a di*k measuring thing or a 'tacticool' look at how many I have in case the zombies come?
I don't really buy the explanation that you need so many because the magazine springs wear down... wouldn't you just spend a fraction of the money and take what is literally 2 minutes to change it out with a replacement after xxxx number of rounds?
For my practicalities two .40 S&W/.357 and two .9mm (which I can't get) for my M&P 40c with 9mm conversion Barrel meets my requirements as a conceal carry/range junky.
My reasoning:
At the range I only need two. I like to pause, load a magazine and think about what just happened when I shot. I also can't justify loading up 10 magazines before I go to the range which costs a lot more in magazine expenses and is still taking exactly as much time to do as if I was at the range to do it... idk. I might be missing something there.
Conceal carry: I hardly want to carry a gun AND a single spare magazine. I will never carry more than a single extra mag. Well... unless the zombies come... but in that eventuality I will be open carrying my m&p .22 with pockets full of loose .22lr rounds because M&P 22 magazines are ridiculously impossible to find.
Maybe I am just grumpy about the guys/gals that go out and buy 6 9mm M&P mags in a single sitting for their far reaching doomsday/DHS stealing our guns/Red Dawn scenario now makes it so I can't even get one to reliably feed my 9mm conversion so I can conceal carry.
Okay... done ranting about this subject... until next month when I still don't have a 9mm mag.