Doublestar-ACE’s M4 SOCOM AR-15 Buttstock Gen 4 is one of the strongest stocks in the AR market. It is machined from 6061 T6 and is ideal for CQB or breaching doors without the fear of bending the receiver extension tube. The SOCOM design provides five adjustable positions and its closed cell foam overtube provides an extremely comfortable cheek weld. It uses a CAR buffer and CAR length spring. Includes proprietary tube” stock body” .5″ butt pad” extended castle nut” ambidextrous end plate and all needed hardware. Adjusts from 7.5″ to 9.5″.