The M16a4 is a great weapon it does decent damage and holds a decent amount of rounds, doing about 68-50 damage per shot and holding the standard of thirty rounds with sixty in reserve and reloads in about two seconds but where this gun shines is when you complete the campeign and get all thirty enemy intellegence and unlock the "unlimated ammo cheat" go to "war pig" go to where there is an enemy tower sniping you as you enter, you should be able to watch one of your teamates die and pray to code of the game they drop a M16A4 grenedier switch two the grenade launcher activate the cheat then let all hell loose and ffire grenades as fast as the gun istelf fires