I agree, the M6 Scout, Although sometimes found with a .22 Hornet over the .410.
I've one in .22lr and a stainless one in .22 Hornet. Better be sitting down when you buy .22 hornet ammo. I carry it as my "pack" gun. I'm not intending to fire 1000's of rounds through it, but it had reasonable range and far better hitting power than a .22lr. Not too bad on small game, doesn't tear them up too bad.