Tame an over-gassed or suppressed AR-15 with the right amount of buffer mass. The Maxim Defense SCW H2 Buffer and Spring provides 4.65 oz. of weight to slow bolt carrier velocity on builds that run hard, reducing wear on components and delivering a noticeably flatter shooting experience. The Maxim Defense SCW H2 Buffer and Spring is a 4.65 oz. heavy buffer and spring assembly designed to enhance Maxim Defense SCW stock and pistol brace systems on the AR-15 platform.