Mag stacking 

Binding or taping gun magazines together on a semiautomatic or automatic weapon to make it easier to reload a fresh magazine when shooting.

We are going out on a dangerous mission and we may run into a lot of enemy soldiers, so mag stacking is a must. gun, bullets, weapon, gun magazine, soldier, rifle, semiautomatic, automatic, machine gun, m4, m16, ak47

Mag stacking by joecoolthefool February 15, 2015