Accu-Shot ACS and STR Stocks Monopod Rail Kit Black. The is machined from Type III hard anodized T6061 Aluminum and steel. The two piece adaptor replaces the polymer insert found on these stocks and is held in place with the supplied fasteners. Other than removing the buttpad and sliding the insert out no modification is required. A 1/8 hex wrench is required but NOT included. Available in black only and weighs 1 ounce. Specifications for Accu-Shot ACS and STR Stocks Monopod Rail Kit: Manufacturer: Accu-Shot Country of Origin: USA Package Contents: Accu-Shot ACS and STR Stocks Monopod Rail Kit Accu-Shot BT52 ACS and STR Stocks Monopod Rail Kit Black