This is one of the hardest parts to find for a Vietnam era M60. The rubber stock boots replaced the full metal and plastic buttstock. The result is a much smaller profile and they were originally used on M60B flexible mounted guns in helicopters as well as in door guns on before the D kits became widely available. They were also popular later in the war with SEALs who used them on their cut-down guns. This one is in unissued condition nice usable condition with no cracks or splits. 1968 dated.