 The most common weapons used by the cartels are the AR-15, M16, M4, AK-47, AKM and Type 56 assault rifles.Handguns are very diverse, but the FN Five-seven (dubbed "Matapolicías" or "Cop-killer" by criminals) is a popular choice due to its armor-piercing capability.Grenade launchers are known to have been used against Mexican security forces, H&K G36s and M4 carbines with M203 grenade launchers have been confiscated.