Loosely based off a gun, the Black Barrel is mostly black with purple spikes-like objects on top. Being a Black Arms-native gun, the Black Barrel is of an alien design with a wide, round frame and a white and purple eye-like barrel on the front. It has the Black Arms logo on both sides.
Black Barrels can be dropped by defeated Black Warriors that wield them, released from breakable Containers, or destroying Cell Cannons. Touching one will make the playable character pick it up automatically, and pressing // (whether on the ground or in mid-air) while using the crosshair to aim will fire it. As a cannon, the Black Barrel can eliminate surrounding obstacles and enemies with an explosion. Less than impressive, but not mediocre, the Black Barrel has a short range, low rate of firing, and delivers medium damage, but can take out at least five enemies alone. A Black Barrel has a total of eight shots, and once those run out, it becomes useless. However, it can be reloaded with another eight shots by picking up another Black Barrel.