For the operator that requires a specially weighted buffer or wants to fine tune their weapon, the VLTOR A5 buffers come in five unique weights. These buffers are only compatible with other VLTOR A5 products. Body of the buffer is 7075 T6 aluminum Mil-Spec Type III clear hard coat anodized A5H0: 3.80oz A5H1: 4.56oz A5H2: 5.33oz