By balancer do you mean something on the end of the barrel? Generally the thin barrel minis, especially 180 series rifles, have greatly improved accuracy with almost anything for extra weight on the end of the barrel. Flash hider, suppressor, large thread protector, etc. The accu-strut is pretty cheap and by almost all reviews does wonders although it isn't really just weight.
A picture of this item might get you more of a response as I don't know what it is.
The ruger target rifle has an adjustible harmonics balancer, but I believe it is steel.