As with
@Bassbob , my worries are - in order - breakage/wear from use, product discontinuation, and the ever-changing legal climate.
Tackling these in reverse order:
I'm a first generation immigrant, Naturalized Citizen in the early 90s along with my parents. I don't have a "Second Amendment Legacy" as my parents were never all that interested in firearms as a hobby. Grandfathering some magazines for the generations that come after me isn't unreasonable, I believe, given the evolving political climate.
Product discontinuations and other logistical changes is also a concern when looking at a longer timespan: decades instead of years. Look at how frequently posts surface on XDTalk now for certain magazines that are no longer available just within the XD/XDm line-up. And let's not forget that changes in the marketplace can also show impact here: Okay/Surefeed recently announced that they will no longer be in the magazine business as of the end of this year.....
The biggest concern that I have, personally, is with breakage and wear from training and earnest self-guided practice. Magazines are regarded by most SMEs as the most vulnerable part of modern box-mag fed semi-automatic firearms. Couple this with the fact that they're relentlessly cycled (spring compression/decompression) and often subject to high-impact or even crush forces, I think it is very reasonable to want to have a good stock of replacements.
How many?
Larry Vickers suggested that any "serious" weapon should have no less than five (5)
vetted (
note that this means that it's more than just "having" the magazine, but rather having made certain that it functions properly in the weapon) magazines for it. My word is next to nothing against his
, so I've adopted this number as my base, too. That said, for my defensive weapons, I personally have decided to accrue many times that number, based on the three criteria above.
I'm nowhere near that cache seen in
@Annihilator 's post further up...but I'm working towards it.