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I think you owe it to yourself to be familiar with the weapon you are carrying as well as proving it will fire if needed.

I suppose there are other ways to do that (i.e. you are familiar with the make and model of the weapon and you bought it from a friend who has fired it and can vouch for it's functionality) but I would want to shoot it and make sure what I was carrying would work and I was familiar with it's operation.

My two cents...