Magpul UBR Gen2 Stock Collapsible Flat Dark Earth Synthetic for AR-15, M16, M4, AR10, SR25 includes an integrated custom A5/SR25 receiver extension tube for secure mounting on carbine or A5 buffer systems. Adjustable LOP across 8 fixed-lockup positions with consistent cheek weld. Reversible, removable storage compartment holds batteries and small parts. Front and rear ambidextrous QD sling sockets support one- and two-point sling setups; includes two footman's loops. MOE SL angled-toe rubber butt pad provides anti-slip surface and improved fit with body armor. Weighs 21.20 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.