The principal armament of the Caladius is the double-barrelled Iliastus accelerator cannon, an advanced weapon which was to become the precursor to the main weapon of the Legiones Astartes Sicaran Battle Tank. The Grav-Tank is also armed with a twin-linked Lastrum bolt cannon, exemplars of bolt-weapon technology whose bolt shells are customised mass-reactive heliothermic warheads.

The Legio Custodes Caladius Grav-Tank is a complete, multi-part resin kit.