CMMG AR15 H2 Buffer Assembly has one steel and two tungsten weights for additional mass than the H buffer. Heavier buffers can be used to reduce felt recoil and improve erratic case ejection. It is recommended when tuning a rifle to step up buffer weights incrementally as too heavy of a buffer can affect function.H2 Buffer weight: 4.6 ozAll CMMG products come with their Lifetime Quality Guarantee.