Assault Rifle - 5.56mmx45 - U.S. - 700 RPM - When extra range or firepower is needed, RAINBOW turns to Colt's M16A1. Tried and true, it's 5.56 caliber easily pierces Level II body armor.It comes standard with a low-power holo-sight and single, three round, and full-auto trigger group.This Gun has a berretta on it for extra!