Enables operator to carry spare mag, ready to use on weapon. Also use as unique ergonomic fore grip. Quick release button-just slide grip onto rail. Back up locking screw. Magazine release button-similar to AR15-M16 to quick. Features: . Quick Release button - just slide the grip onto the rail. . Backup Locking Screw - Should you decide to lock it in place when not using the quick release mechanism. . Magazine release button - similar to the AR15/M16 one - to quickly release the magazine. . Can be used asan ergonomic foregrip even without the magazine inside.