VLTOR Weapon Systems Buffer Spring, Standard Weight A5 Buffer (5.3 oz), Lower Receiver End Plate and Receiver Extension Tube Lock Ring, ONLY Compatible with other Vltor A5 Buffer Tubes SP-A5

Standard M16A2 action spring and the specially-designed buffer, the EMOD A5 system offers the trustworthiness of a fixed-stock rifle, while reducing felt recoil and rate of fire for improved weapon control. A5 Receiver Extension and A5 Spring/Buffer kit are sold separately to enable upgrading an existing carbine to the longer, 7-position extension for use with other mil-spec M4-type buttstocks. A5 Spring/Buffer kit must be used only in the Vltor A5 receiver extension.