Use the stock ring set, its designed for the piston and is compatible with the chrome. They are designed for proper sealing and long life.
And Bowman rings are designed for improper sealing and short life? This is news to me.
Using aftermarket parts is asking for trouble.
Trouble is my middle name, Mister.
Actually, using OEMparts from Stihl would cost almost $400 and they're only available through dealers. Kind of defeats the purpose of the exercise, no? From what I read about the aftermarket kits on the chainsaw forums, they work great for most people who use them. Apparently the most common problem is the rings, which aren't manufactured with the same Q.C. as the other parts. This is my thinking vis-a-vis getting Mr. Bowman's help.
Thanks for the feedback