The Sigma is a 155 mm/52-caliber self-propelled howitzer from Elbit Systems, the same manufacturer behind the Atmos 2000 supplied to the Philippine Army. Mounted in a fully automated turret on a 10-wheel chassis, the Sigma uses an automatic loading system and operates with a three-person crew. Its automation enables MRSI (Multiple Round Simultaneous Impact): the gun fires multiple rounds at different trajectories so they land on the target at nearly the same time. Physically larger than Elbit’s

155 mm caliber artillery shell, shot from a howitzer. | NextGen PHDefense