In the "silly pistols on rifle actions" department, there was a company written up in Combat Handguns (I think) not long ago, that one-upped both the AR pistols and the Draco. They cut down a .308 MBR to make a .308 pistol - which weighs more than some of my rifles.
If anyone is seriously thinking of carrying a .410 revolver for defense, please, PLEASE go read the penetration tests at the boxotruth.com and wise up. You wouldn't think of hunting grouse with a 3 or 4 inch barreled .410 shotgun. I'm speaking as one who was building shot loads for a 3 inch .44 Special 35 years ago, and using them on starlings - or trying to.
Just get a nice .44 or .45 revolver, if that's your thing.