Magpul MOE SL-S Carbine Stock Stealth Grey Synthetic for AR-15, M16, M4 with Mil-Spec Tube (Tube Not Included) adds two waterproof storage compartments to the MOE SL design for extra batteries or small parts. Fits Mil-Spec carbine receiver extensions. Storage tubes are O-ring sealed, waterproof to 10m, and each hold up to two CR123A or AA batteries, positioned to enhance cheek weld while maintaining a slim profile. Dual-side, shielded release levers enable fast ambidextrous LOP adjustments. Internal anti-rattle feature reduces wobble and noise. Anti-slip butt pad with rollover toe fits well with body armor. Built-in ambidextrous QD sling mount and two footman's loops. Compatible with ASAP/ASAP QD mounts. Weighs 12.80 oz. Made in the U.S.A. Safety note Follow all manufacturer installation instructions. Verify proper fit and secure mounting before use. Comply with local firearm laws and regulations.