Whilst I'm not a great fan of pistols being held for humane dispatch, (as I believe the privilege is abused by many!), this could actually be a very versatile tool!
The Bond Derringer 'hand cannon'!
Available down to about 5" long and capable of firing .410 cartridges as well as .45 Long Colts! Best of both worlds and only two shot.
So here's the question for the legal buffs......................
Can I have one ??????