This product has been out for a while now. The idea behind it is somewhat like glass bedding the barrel in that it is designed to limit and ot stabalize the vibration of the barrel. In rifles where vibration may be causeing inaccuracy it could make quite a bit of difference. Its sort of meant to do the same thing as the boss system without the extra noise of the muzzle brake. I have not tried one yet but I have read reports on other sites that they work pretty well.