The Ptolemaic engineers produced these suits based on the data they had about the LV Armor. They altered the design, removing the cockpit canopy and replacing it with a sensor eye system to provide more protection to the pilot. The Ptolemaics had created several variants of them, with weapons ranging from miniguns to claws with fold-out cannons, but even though they were built using the most advanced materials available to the Ptolemaics (accounting for their high in-game health when using lower-level infantry weapons), heavier infantry weapons and vehicle-mounted cannons still destroy them.
|MG Unit: This unit is the fastest, and is armed with a minigun on each arm. it fires 3-round bursts from the right arm-mounted weapon and uses the a backpack ammo supply similar to that of the Rebel minigunner. This is only variant that has multiple sensor eyes instead of the single eye seen on the others.|
|Space MG Unit: A variant of the original MG unit possessing slightly higher durability, but fires a much more longer burst of machine gun fire. Appears in Metal Slug Attack.|
|Laser Unit: A new variant, this time capable to use laser weapons similar to whose Josette can use. Durability, maneuverability and attack distance were greatly improved respect previous versions. Appears in Metal Slug Attack.|
|Armor Unit: Basically a regular Gunner Unit with extra armor on the head, which allows it to withstand more damage. In Metal Slug Defense, it can shoot energy projectiles similar to the Rebel Walker.|
|Abyss Armor Unit: Armor Units imbued with abyssal power and just an upgrade over the original unit. Appears in Metal Slug Attack.|
- Multiple variants and early designs have appeared in marketing material:
- In Metal Slug 5's arcade flyer, all Units appear to have teeth. One of them is an unused hybrid plane/Unit. The MG Unit had a claw instead of the Minigun. The bulkier one could be an early concept of the "Armor Unit". One of these Units with the "shark smile" can be seen under construction in Mission 3's last section and Mission 5's tower section.
- On the cover of the PlayStation 2's release, a unique Unit is shown behind the heroes. It appears to have teeth and seems to have a single eye on one side of its head, rather than in the middle as the Units have in game.
- In Metal Slug Defense, the Gunner Unit and Armor Unit's names were erroneously spelled as "Gunnner Unit" and "Amor Unit" respectively.