barrel tuner

Please explain how a barrel tuner works on a .22 barrel? Thanks for your answer, Hank45

Someone cam explain it better than me. But to keep it simple.
When the gun is fired the firing and the bullet going down the barrel sets up virabrations in the barrel. This causes the barrel to move. A tuner on the barrel dampens these vibrations to what you call a sweet spot where the bullet exists the barrel at the best for accuracy.