If you have already watched the first part of the AR-15/M16/M4 History by Anvil Airsoft TV, then you're ready to watch the second part... "Here's the second part of our history of the AR-15/M16/M4 in US service. In this part we cover the M16A2, Carbine programme, M4 & M4A1 Carbine, the URG-I and briefly cover the future."