Primary Weapons Systems Enhanced Carbine Buffer, H3, 5.5oz 5PWCBH3-1F 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. H3 Weight: 5.5 oz Nearly an ounce heavier" the PWS H3 Buffer is an intermediate option.