Magpul MOE SL-S Mil-Spec AR-15/M4 Rifle Stock - Black - The Magpul MOE SL-S (Storage) Mil-Spec is the storage-capable version of the flagship Magpul MOE SL carbine stock and a direct replacement buttstock for AR-15/M4 carbines. The sleek profile, dual-side release latches, and waterproof battery tubes make it the slimmest storage tube stock available. The SL-S provides an enhanced cheek weld and true, O-ring sealed, 10m waterproof storage area desired by many, but fits it into the narrowest package possible to allow a more upright head position and minimize bulk. A rolled toe and angled rubber butt-pad are optimized for use with body armor, and an ambidextrous QD sling swivel socket is included. A unique leaf-spring tension system provides a solid fit on mil-spec receiver extensions, with slightly less friction than the original SL. The MOE SL-S is the most intuitive, comfortable, and efficient storage stock available. AR-10/AR-15/M4/M16/M110/SR25 Platforms Made In The USA