The FightLite Industries MCR Magazine Adapter plugs directly into the standard magazine well of AR15/M16/M4 firearms equipped with a Fightlite belt-fed upper and permits mounting of linked ammo containers directly to the firearm! This aids mobility and ammunition handling for belt-fed firearms and fits all models of FightLite MCR, ARES Shrike 5.56 and ARES AMG-2. To remove, simply press the normal magazine release button and it drops away from your lower; a must-have item for the dual-feed MCR!