All Terrain MegaCaliber Six

The All Terrain MegaCaliber Six (AT-M6), also known as the Gorilla Walker or First Order Heavy Assault Walker, was a mobile heavy artillery walker used by the First Order during their war with the Resistance. As the biggest walker in the First Order's arsenal, the AT-M6 was much larger than the All Terrain Armored Transport used by the Galactic Empire, and was operated by specialist First Order Walker Drivers, who were responsible for the use of the machine's most prominent feature, a single MegaCaliber Six turbolaser cannon mounted to its back for which the walker was named.

The AT-M6 was a heavily armored walker utilized by the First Order military during their war against the Resistance. Its design was half siege walker and half psychological weapon, with its massive height, imposing arms, and terrifying noises capable of breaking whole armies before its weapons came into range. The AT-M6 was essentially a siege platform, with the walker's entire frame based around accommodating the MegaCaliber Six turbolaser cannon, a heavy turbolaser which could punch through planetary shields to end sieges with one swift strike. First Order researchers managed to install the giant cannon by reinforcing the front legs, giving the walker stability and the look of a giant simian predator. To power its main weapon the walker carried a dedicated power generator as well as a number of auxiliary fuel cells that were mounted on the walker's back behind the cannon compartment to reduce the recharge time between shots.