Airsoft Sidewinder Fast Loader / Speedloader M4 (red)
The Fast Speedloader are great for quickly filling M4 magazines. Instead of the annoying pressing, the balls are transported into the magazine by a crank. The Speedloader itself is made of sturdy plastic and holds around 1000 BBs.
A little tip: Secure the screw on the crank with locktide, as this usually loosens a little over a longer period of time.