The JE Machine SOPMOD Stock was originally designed by the naval surface warfare center to equip some of America's most elite warfighters. The iconic SOPMOD buttstock is the go to choice for our nation's best. The SOPMOD AR Buttstock is meticulously crafted from ultra-modern high strength impact resistant polymer to deliver the reliable performance you can count on for a lifetime. Equipped with ambidextrous universal quick detach mounting point, watertight storage compartments, wide cheek weld, and recoil reducing buttpad. FeaturesWide cheek weld provides a wide contact surface for user comfortIntegrated quick detach sling swivel sockets on both sidesWatertight battery storage for CR123A 3V lithium batteriesImpact-resistant, high-strength polymer