Ruger single six in stainless is about as bomb proof as you can get. Mark 11 is a fine weapon, but an auto will be a bit finickier with ammo. Anything will work in the single six including .22 shorts. The Ruger Bearcat is also a fine candidate. Quite a bit smaller than the single six, it does not have target sites, but at finish em off range, that probably isnt a factor. The Smith and wesson double action Kit Gun is also a great weapon, landing between the other two in size, and it comes with target sites also. I sold my stainless single six, and have regretted it ever since. I still have my Mark 11, but it is a bear to break down to clean thoroughly, (a factor being carried outside frequently in sloppy weather) and heavier.