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. Mfg: Vltor Weapon Systems SPECS: Includes action spring, A5 buffer, receiver end lock plate, and receiver end lock nut. Compatible with gas piston systems. A5 Spring/Buffer kit must be used only in the Vltor A5 receiver extension; attempting to use these parts in a standard M4 receiver extension will result in damage to t