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[–] DrSelfAppointed ago 

The typically have a shelf life too, don't they? Something sub 10 years?

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[–] Nosferatjew [S] 0 points 1 point (+1|-0) ago  (edited ago)

While I'm sure it likely depends on the materials being used, they probably last way longer than any stated shelf life so long as they are not stored in a space with large fluctuations in temperature, or are in direct sunlight. My guess is they are given a shelf life mostly so that government agencies end up buying them more frequently.

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[–] DrSelfAppointed ago 

You might be right on that last part. I think it is ceramic types that have a shelf life. I would think steel or other hard alloy types wouldn't have a self life. They would be heavy af though.