One of eight US Army M-16 30 round Metal Magazine with green paracord is installed the base of the magazine, providing a finger loop for fast magazine changes. A lot of Canadian soldiers brought or traded for these American magazines because the original Canadian C-7 magazines were made of plastic and were of very inferior quality. Standard USGI aluminum 30 round M16 magazines weigh 3.9 oz (110 g) empty and are 7.1 inches (180 mm) long.