Mobile Armor: Behemoth - Rise of the Dawn
Mechs can equip weapons that have been sized appropriately for them and their profiles are identical to their Player’s Handbook counterparts with the exception that the number of damage dice is doubled and the weights should be adjusted.
Thus a Mech Longsword would do 2d8 points of damage when wielded one handed and would do 2d10 if wielded with two using the Versatile rule.
Mechs follow the same rules as characters in regards to how they function with weapon special rules. A Mech may not use a weapon with the Two-Handed Property unless it has two Dexterous Hand modifications.
Mech Cannon – 4d10 Damage – Ammunition (Range 200/800), Loading, Hopper (5 shots)