If I read it correctly, your SS was made in 1974:
http://www.ruger.com/service/productHistory/RE-NMSSix.html

You might be able to find a cylinder for it. I've heard of many folks getting lucky. Also, you might want to ask the shop to see if they knew where they got it...or if the cylinder is there...it might be in a red cloth bag.

Aqualung

Last edited by Aqualung; 01/14/10. Reason: fixed tags and added info
"Bambi's Good Eatin'!"
- Me

"...Somewhere, there are Brownings in a two-hand hold,
Cocked and locked, one up the spout..."
- Jethro Tull