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B5 Systems Enhanced SOPMOD AR15 Milspec Buttstock in Olive Drab Green (SOP-1097), SOPMOD buttstocks were originally developed by NSWC-Crane for use with SOCOM's. SOPMOD Special Operations Peculiar Modification M4A1 carbines. B5 systems, a well-known defense, and aerospace contractor were selected in 2009 to supply the US Army with SOPMOD stocks. These quality stocks are now available on the commercial market. Featuring sloped sides for a superior cheek weld, watertight battery storage compartments, and a tight fit on mil-spec carbine receiver extension tubes.