Is the GM II Reliable? Federation’s “Good Enough” Workhorse

The RGM-79R/RMS-179 GM II was an improved version of the original RGM-79 GM. Its development gained importance after Operation Stardust weakened the Earth Federation’s military presence in space and forced it to rebuild without wasting resources on an entirely new mass-production platform.

The Federation established two production paths. Existing GMs could be converted into RGM-79R units, while newly manufactured machines received the RMS-179 designation. Both versions introduced a more powerful generator, improved sensors and propulsion, and a panoramic monitor with a linear seat.

But was the result reliable enough for combat?

Weapons — 8/10

The GM II replaced the original GM’s beam spray gun with a stronger and more accurate E-CAP-powered beam rifle. Its upgraded generator also supported an improved beam saber, while two head-mounted 60mm Vulcan guns and a shield completed its standard equipment.

Its greatest advantage, however, was compatibility. The GM II could use numerous weapons inherited from earlier Federation machines, including machine guns, Hyper Bazookas and specialized equipment such as the Aqua GM’s harpoon gun. It was also seen using weapons such as the Hizack beam rifle, 90mm GM rifle and 170mm cannon.

That combination of improved standard weapons and access to existing Federation stockpiles earns the GM II 8/10 for Weapons.

Armor — 6/10

The GM II used a titanium alloy and ceramic composite instead of relying solely on the titanium-alloy armor associated with the original GM. This provided an incremental improvement against conventional projectiles and heat without forcing the Federation to construct every machine from expensive Gundarium alloy.

The improvement was useful, but it did not transform the GM II into a heavily protected mobile suit. Its armor remained vulnerable to the increasingly powerful beam weapons appearing during the Gryps Conflict.

The GM II receives 6/10 for Armor, its better than its predecessor, but only slightly above average.

Mobility — 5/10

Improved thrusters, acceleration and additional verniers made the GM II more maneuverable than the original GM, particularly in space. These changes were still evolutionary rather than revolutionary.

Once the Gryps Conflict began, the design quickly showed its age against newer machines. Mobile suits such as the MSA-003 Nemo offered superior overall performance, while advanced prototypes and transformable units pushed combat beyond what the GM II had been designed to handle.

It performed its intended job until a major conflict arrived, earning 5/10 for Mobility.

Versatility — 5/10

The GM II’s broad weapon compatibility allowed it to operate in space, on Earth, inside colonies and during missions such as orbital drops. Pilots could also select physical weapons when firing a beam rifle inside a colony would create unnecessary danger.

However, the platform produced relatively few dedicated variants compared with the original GM family. Specialized machines such as the GM II Semi-Striker existed, but much of the design’s flexibility came from changing weapons and equipment rather than creating entirely new configurations.

That makes the GM II adaptable but not exceptionally modular, resulting in 5/10 for Versatility.

Cost-Effectiveness — 7/10

Cost-effectiveness was the purpose of the entire program. The Federation could modernize existing GMs, manufacture new units through a separate production line and continue using weapons and replacement parts already available throughout its military network.

Approximately 10,000 GM IIs were reportedly produced, creating a large enough fleet that the AEUG could acquire and operate many of them while developing more advanced machines. The design also provided a foundation for conversion into the considerably improved RGM-86R GM III.

The GM II continued appearing alongside newer mobile suits long after it became obsolete, including during the attacks on Dakar and Torrington Base in UC 0096. That longevity does not mean it remained competitive, but it demonstrates how useful and supportable the platform was.

The GM II earns 7/10 for Cost-Effectiveness.

Final Rating — 6.2/10

● Weapons: 8/10

● Armor: 6/10

● Mobility: 5/10

● Versatility: 5/10

● Cost-Effectiveness: 7/10

● Overall: 6.2/10 — Above Average

So, is the GM II reliable? Yes, just enough.

It was not built to defeat every advanced mobile suit that appeared during the Gryps Conflict. It was built to restore the Federation’s numbers, counter Zeon remnants, hold the line and buy time until better machines entered service. In those roles, it succeeded.

GSE would trust the GM II for postwar security, anti-remnant operations and early Gryps-era support. Against later-generation mobile suits, however, it should be replaced or upgraded as soon as a GM III, Nemo or another modern platform becomes available.

The GM II was never revolutionary. It simply took a proven machine and improved nearly every area that mattered—and sometimes, being reliable means doing exactly what was required without pretending to be anything more.

Watch the full “Is the GM II Reliable?” video and let us know whether its 6.2/10 rating is fair.