The MOE SL Stock - Mil-Spec Model (MOE Slim Line) is a drop-in replacement buttstock for AR15/M4 carbines using mil-spec sized receiver extension tubes.Designed for the modern battlefield, the sleek profile, dual-side release latches, rolled toe, and angled rubber butt-pad are optimized for use with body armor or modular gear and provides for efficient shoulder transitions.Made in U.S.A.Features: Mounts on mil-spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, LMT, Ruger, S&W, SIG, and others (please see the note below) Sloping cheek weld combines a slim profile with user comfort Dual-side release latch provides easy adjustment while remaining anti-snag Premium chrome-silicon lock spring provides positive locking and long service life Internal anti-rattle feature minimizes wobble on receiver extension tube Rubber butt-pad offers an anti-slip surface and increases impact protection Rollover on the toe allows for easier shoulder transitions and better fit when using body armor Compatible with Magpul ASAP, ASAP QD, and other receiver-mount sling attachments Sling Mounts Rear - Integral push-button QD swivel sling mount accommodates up to 1.5" swivels (ambidextrous) Rear/Bottom - 1.25" sling loopSpecifications: Colors: Black, FDE, Grey, ODG Weight: 9.6 oz. Weight, w/receiver extension: 13.6 oz. Length, max: 7.2 in. LOP Adjustment Range: 3.3 in. LOP, M4 Collapsed: ~10.8 in. LOP, M4 Extended: ~14.1 in.NOTE: There are two basic sizes of M4 Carbine receiver extensions (buffer tubes): mil-spec and commercial-spec. If you have a commercial-spec size extension on your rifle, make sure to order the Commercial-Spec MOE SL.