The Strike Industries Viper MIL-SPEC Buttstock offers a 9.25- to 12-inch length of pull. It's made from glass-reinforced polymer and fits AR-15, M16 and M4 firearms. It also employs the use of MIL-SPEC-size receiver extension tubes. StrikeIndustries Strike Industries Viper MIL-SPEC Buttstock - Gun Cases And Racks at Academy Sports
