Anyone who has struggled to load a magazine before will be able to appreciate this product.
B&T AG, also known as Brügger & Thomet, shows off their innovative MP5-style magazine speed loader in this video. The device works by grabbing five rounds from a box at a time, which are then effortlessly funneled into the magazine. Judging by this video alone the speed loader looks to be an incredibly effective and easy to use the product.
Now someone just has to make a speed loader like this for a more-commonly-used firearm.