Geissele's AR-15 Super 42 Tungsten Buffer Weight allows you to change your Geissele Super 42 buffer from an H1 weighted buffer to an H2 or H3. To change the Geissele Automatics H1 Buffer assembly to the heavier H2 or H3 buffer setup" you will need to disassemble and re-assemble the buffer replacing the steel weights with the correct number of tungsten weights. Fine tune your buffer to your exact requirements for reliable" soft-shooting function.