An improved buttstock for a firearm is disclosed, the buttstock comprising a comb, the comb comprising an indexing surface on a comb extension, the comb extension being configured to move between an expanded configuration and a retracted configuration; a buttstock, the buttstock comprising a buttpad extension indexing surface, the buttstock being configured to move between an expanded configuration and a retracted configuration. A common lock can secure both the comb extension and the buttpad extension in a fixed position. The common lock can release one or both of the comb extension and the buttpad extension to slide with respect to the body of the stock.