Kimber's pepper spray guns look very good because they offer a gunpowder explosion delivery of the pepper spray which should be much better than the normal air pressured pepper spray system. I have never heard of any use of these products so their use in the field has not been validated to my knowledge. You will have only two shots so better be calm and aim well or the Kimber pepper spray gun will be out of "bullets" and totally useless. They are not going to help you if more than two people threaten you. While there are some reloadable Kimber pepper spray guns you are not going to have time to reload.
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