A three barreled M197 20- mm Gatling gun rests in front of a AH-1Z "Viper", the latest gunship to join the Marine Corps. The new Cobra can hold more than 700 rounds and fire them at a rate of approximately 730 per minute. The new Cobra can also carry twice the number of Hellfire missiles compared to the AH-1W ?Super Cobra.? (U.S. Marine Corps photo by Lance Cpl. Christopher O'Quin) (Released) - A three barreled M197 20- mm Gatling gun rests in front of a AH-1Z "Viper", the latest gunship to join the Marine Corps. The new Cobra can hold more than 700 rounds and fire them at a rate of approximately 730 per minute. The new Cobra can also carry twice the number of Hellfire missiles compared to the AH-1W ?Super Cobra.? (U.S. Marine Corps photo by Lance Cpl. Christopher O'Quin) (Released)