The Heavy Machine Gun is gray, with a meter-long frame and an even thinner meter-long barrel. It possesses a dark gray butt stock, as well as a hand-sized grip on the bottom with a box-shaped magazine in front of it, and a frontal sight on top.
Heavy Machine Guns can be dropped by defeated GUN robots that wield them, released from breakable Containers, or destroying GUN turrets. Touching one will make the playable character pick it up automatically, and pressing // (whether on the ground or in mid-air) will fire it. Holding down // will cause it fire continuous shots. As a gun, the Heavy Machine Gun can shoot enemies from a distance (targets within range will be automatically targeted). It has high damage output and a long attack range. A Heavy Machine Gun has a total of thirty shots, and once those run out, it becomes useless. However, it can be reloaded with another thirty shots by picking up another Heavy Machine Gun.