This is the spring and buffer used in the Vltor A5 Recoil System. Kit comes complete with Rifle Length Spring, Standard A5 Buffer (weighs 5.3 oz), Receiver End Lock Plate and Nut.

Note: The A5 Spring and Buffer kit is designed to work only in the Vltor A5 Recoil System and must be used with an A5 or AR10 Short Rail receiver extension - attempting to use these parts in a regular carbine receiver extension will result in damage.