it may be an off the wall choice, but a bond arms derringer is all steel, super tough and has no moving parts to become gummed up. yes, just two shots, but a couple of 410 handgun specific, 45lc or 38sp (my favorites) rounds are more than enough accurate for lawfully acceptable and effective social work. if buying used get the new model with upgraded action (denoted by indented trigger and flared hammer) and replace wood with rubber grips (large size for “4” calibers, small for others).