I tried one of Butler Creeks polymere barrels, not a true carbon fiber barrel and was not impressed it did not provide the accuracy I had come to expect from my SS custom Olympic arms barrel, when your spoiled your spoiled. A friend now has the Butler Creek I had and he likes it, but he also likes Simmons scopes. no acounting for lack of taste I guess.
As for the poly barrel if you are a occosional shooter they are ok, chamber was a bit loose to my way of thinking but not a bad plinking barrel, if you have an older Ruger you are much better off staying with the Ruger tube and spending your money on a trigger upgrade unless you are going to spend your hard earned cash on some thing like a Volquartsen carbon fiber, I have shot one and it's the real thing.
Bullwnkl.