Update; today's funshow turned up nothing for Single Sixs, or even Bearcats.
The only dual-cylinder .22 guns were overpriced Chiappas, Plinkertons, Rough Riders - none in 4" barrels.
Then I found this Peacemaker with untouched WMR cylinder, box, manual, and apparently non-standard grips. Couldn't pass it up. Now I have to learn all about Colts.
