When purchasing Tacfire Inc or any other brand from eGoods365.com store, you can be sure that (a) you are purchasing from US based company with the most responsive and friendly customer service; (b) an authentic, not a counterfeit and not a refurbished product.
USA made .308 buffer spring is constructed of the same material found in piano wire. This is meant to reduce the "twang, you hear whenever a round is fired from an AR.
