Well, I just read the instruction manual
I think by the time you unfold that sucker, cock it and fire-you'd be in a world of hurt.
Next and perhaps more importantly, this looks like an "any other weapon" or destructive device" as defined by the ATF-kinda like those .22 or .38 "pens" that are outlawed.
Me-I'll take my NAA .22 when deep cover and extreme hide is required.