HG 1/144 Calamity Gundam

One of three second-generation GAT-X machines, Calamity is built on the X100-series frame and inherits GAT-X103 Buster Gundam's artillery attack concept. It can also be used to provide support from the rear and is armed with several powerful range weapons, but it completely lacks any close combat weaponry. Its armament consisted of two back-mounted high-energy long-range beam cannons, a chest-mounted multi-phase energy cannon, 2-barrel ram cannon equipped shield attached to the left arm and a hand-carried plasma-sabot bazooka.

Lore excerpt from gundam.fandom.com.