This high performance upgrade replaces your Ruger® 10/22® stock aluminum v-block with a precision made stainless steel unit. By doing so the barrel will be pre-loaded upward and will eliminate the barrel droop/sag that is commonly seen over time with a stock aluminum v-block. This allows for more consistent shot placement. This part will fit virtually any after market receiver without any gunsmithing needed and assist with free-floating the barrel from the stock.