How many magazines per gun?

[blues]

I like to have a minimum of 6 OEM and at least that many Magpul versions for the range for each Glock.
(Though I have vetted and carry the Magpul 12 GL9 in my G26.)

A dozen or so Magpul magazines so for the AR.

[jwperry]

I like to have 150-ish rounds ready/available for my range sessions and not have to mess with my primary/carry mags. That gives me 8 training mags and 2 carry mags.

I think it also depends on the type of guns you're feeding. I've only had to re-furb my Sig P226/8 mags and metal AK mags (cleaning/springs/followers). Same for when I had M&P9, Hk P30 and HK45 mags. I've had actual failure with steel/aluminum/polymer AR mags, 1911 mags & Glock mags.

I tend to stock up on mags for those guns, but will only pick up spare springs for the other types.

Loaner/"fun" guns don't get extra anything.

[Willard]

I even bought magazines for guns I might buy in the future.

I used to do this in the dark times when we might get a democrat president. Have a lot of mags for guns I don't own. But I guess this is an excuse to buy those guns at some point.