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. Features : Mounts on Mil-Spec sized carbine receiver extension tube Premium chrome-silicon lock provides positive locking and long service Sloping cheek weld combines a slim profile with user comfort Shielded release latch prevents snagging and accidental operation