I had a Single Six a couple years ago. I bought it from the local Gander Mountain. If I remember correctly, it dated to 1956. It didn't have a magnum cylinder and had been back to Ruger for the update. I got it for $300.00. Local price trends at the time were $300 for a .22LR only and $400 for one with a .22 Magnum cylinder included.
I had it for a bit but decided to let it go because it didn't have a magnum cylinder. I sold it to the son of a friend of mine for the $300 I paid for it.
Fast forward a few months and I got a phone call from the store when they were going out of business.
"Hi, this is Brian with Gander Mountain.... Our records show you bought a Ruger Single Six..... We are cleaning out the vault and found a bag of hardware and an extra cylinder......."
Yup, they found the magnum cylinder and all of the original lockwork out of the gun. It seems that the store had taken the gun in on trade in original condition and they had sent it in for the update before putting it out for sale. Somehow, everything got separated from the gun when they sold it.
So, I sold the gun because it didn't have a magnum cylinder, only to get the magnum cylinder given to me months later.
I still haven't replaced it and still lack a single-action .22. Maybe it's time to start looking for a replacement - a 4" barrel this time.
I did the right thing and gave the stuff to the kid that I sold the gun to. I only charged him a cup of coffee.
The gun and the "bag of hardware":