how do you even fire these darn things during a stressful event? the manual of arms seems so awkward that I would be afraid of shooting myself in the heat of the moment. I think something like this could get you in legal trouble if you actually had to use it for SD.
Size wise if a .32/.380/9mm mousegun is too big then you are probably better off carrying a rape whistle because that .22 NAA mini is just going to **** someone off.