The storage-capable version of the flagship Magpul MOE SL carbine stock, the MOE SL-S (Storage) Carbine Stock - Mil-Spec is a direct replacement buttstock for AR15/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. Product Specifications Platform: AR10, AR15, M4, M16, M110, SR25 Compatibility: Mil-Spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, LMT, Ruger, S&W, SIG, and others LOP, M4 Collapsed: ~10.9 in. LOP, M4 Extended: ~14.2 in. LOP Adjustment Range: 3.3 in. Length, max: 7.3 in. Weight: 12.8 oz. Weight, w/ receiver extension: 16.8 oz. Width, max: 2.4 in. Specifications based on standard-length (flat-back) M4 Carbine receiver extension and may vary depending on tube manufacturer. NOTE: There are two basic sizes of M4 Carbine receiver extensions (buffer tubes): Mil-Spec and Commercial-Spec.The MOE SL-S will only fit with the common Mil-Spec tube.