Seems how I posted this in another thread I thought I'd post it here also.
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Here's my idea of what an [u]adequate[/u] stash of mags is:
For 1 AR -
[b]5+ range/practice mags[/b] - 50% or less USGI, Thermolds, Orlites or British Steel.
[b]5+ defensive mags that you have tried and know that they are reliable[/b] - USGI preferably, Thermold secondary & though heavy the British Steel are reliable.
[b]10+ long term stash[/b] - focus primarily on finding 90%+ condition USGI. You can also stash away new Thermolds but ONLY if you think your circumstances will not involve sand, mud, water which can decrease the reliabilty of Thermolds.
For long term stash try to focus primarily on 90% - new condition USGI mags. If you feel you have enough quality mags in your stash and later see [b]really great deals[/b] on lesser condition mags then I think in some instances those can be good additions also. Try to check 'em over and then put them away for last resort, you can always use 'em as range mags if need be.
For every additional AR you add to your collection you should increase your mags at least 60% (but more like 80-90%+). Once you get past 3 AR's then you can cut back on your buying some. If the SHTF there's no way you can carry all that you have in reserve; the object though is to try to have the neccessary supplies to keep you going. The reason for increasing mag quanties (ammo too) when adding add'l AR's is that if needed you can supply someone else as well.