Magpul ACS Carbine Stock Stealth Grey Synthetic for AR-15, M16, M4 with Mil-Spec Tube (Tube Not Included) offers expanded storage and a lengthened, widened cheek weld for comfort. Fits Mil-Spec receiver extensions. Dual water-resistant storage tubes hold up to three CR123A or AA batteries each, with tethered plugs to prevent loss; an additional latching storage bay sits near the butt pad. Ambidextrous release latch and supplemental friction lock system provide quick, secure adjustments shielded from accidental activation. Anti-slip rubber butt pad. Reversible QD cup and footman's loop included; compatible with ASAP/ASAP QD mounts. OAL: 8. Weighs 14.10 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.