The Doublestar ACE M4 SOCOM Stocks design provides five adjustable positions and the closed cell foam overtube provides an extremely comfortable cheek weld. The ACE M4 SOCOM uses a carbine buffer and carbine buffer spring. Includes proprietary tube, stock body, .5? buttpad, extended castle nut, ambi end plate and all needed hardware. Machined from 6061 T6 aluminum.