The LONEX Flash Mag High Capacity Magazine for M4/M16 series rifles has become one of the most favored high cap mags out there. The Lonex Flash Mag holds 360 rounds and is easily filled from the top of the magazine. Once filled, simply pop open the plate on the bottom of the magazine and give the wire a pull several times. This will wind your magazine quickly! No more winding a wheel on the bottom of your magazine, which can take forever! Simply pull several times and you are good to go!