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I can see the value if you're speaking of having the spare within reach or at worst at your vehicle. However, apart from the competition scenario above, most of the time you won't have a range bag. Gaurding against failure by your carry weapon likely wouldn't take the form of an exact copy, as you mention, but a weapon of similar utility (e g a BUG in an ankle holster or a truck gun).

That makes sense to me.

Middle Age Russ wrote: Remember that 2 is 1 and 1 is none, so each of these should be duplicated to ensure you have what you need when you need it.

I would argue that a well built and well designed firearm should, like any other well built and well designed machine, have a few well defined points for failure that are relatively cheap and easy to replace. While I strongly agree with having spares for those parts (e.g. springs, ejectors, barrels), I am forced to wonder if the money spent on a duplicate FIREARM in the name of redundancy might not be better spent on a single, better quality firearm.

12 ga, 20 ga, .22, .308. I think that the pattern of each rifle is user dependant.