Magpul Industries Original Magpul - 9mm Subgun, Fits MP5 Style Magazines, Black MAG003-BLK When installed on the base of a submachine-gun magazine" the original Magpul provides improved speed and controllability during high stress" tactical magazine changes. Durable synthetic rubber loop with recessed rough gripping surface. Quick and easy installation and removal. Patented design based upon the tried and true para-cord loops and duct-tape tabs currently in use with special warfare units worldwide.