Magpul Industries MOE Carbine Stock, Fits AR-15, Mil-Spec Dia, Gray MAG400-GRY The MOE Stock - Mil-Spec Model (Magpul Original Equipment) is a drop-in replacement buttstock for AR15/M16 carbines using mil-spec sized receiver extension tubes. Designed for light" fast action the streamlined A-frame profile avoids snagging and shields the release latch to prevent accidental activation. The Mil-Spec Model includes a standard 0.30" thick rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear.