Our innovative MCR® Magazine Adapter plugs directly into the standard magazine well of AR15/M16/M4 firearms equipped with our 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 our dual-feed MCR®! In Stock and ready to Ship!