Primary Weapons Systems ENHANCED STEEL BODY BUFFER CARBINE H2 MOD 2 4140 Steel Body Buffers have a unique fluted design with minimum contact points, allowing debris to clear easily, while the FNC LIFE HD treatment chemically bonds in lubrication for smoother cycling. Weight: 4.5 oz. The H2 buffer is a standard weight, and ships with all MK1 complete lowers as well as rifles.