The 4-Shot RPG is dark green in color with black trim on both ends of it. It is rectangular in shape with a hilt at the bottom, and has some orange numbers and letters on its frame.
In gameplay, the 4-Shot RPG can only be found in certain Stages. They can be wielded by Gun Beetles, Giga Troopers, and Big Foot enemies who will use them against the player. When fired, the 4-Shot RPG's shots can home in on the player over a certain range.
4-Shot RPGs can be dropped by defeated enemies that wield them or released from breakable Containers. Touching one will make the playable character pick it up automatically. As a lock-on type of weapon, the 4-Shot RPG can unleash a homing attack on enemies. The player must hold // (whether on the ground or in mid-air) and use the control stick to target and lock onto enemies, then release to fire. By comparison, this weapon's shots have a long range and high damage output. A 4-Shot RPG has a total of twelve shots, and once those run out, it becomes useless. However, it can be reloaded with another twelve shots by picking up another 4-Shot RPG.
The 4-Shot RPG is loosely based on the M202 FLASH.