Well, Bandai sells roughly a hundred different Gundam kits a year, and the grades are supposed to make that easy. HG, RG, MG, PG. Simple letters, big price differences. But after twenty-five years of building, I can tell you the letters don't tell you half of what you need to know.
I've built over seventy kits in the last three years alone, and I've broken enough wings to know which grade is a trap.
Here's the short version before I get into it: HG is for everyone, RG is for patient people with good eyes, MG is the sweet spot if you have the shelf space, and PG is a two-week commitment that will test your marriage. I own at least two kits in every grade, and my MGEX Strike Freedom taught me more about fragility than any other kit I've ever touched.
HG: The Grade That Respects Your Time
The High Grade line is where Bandai's color separation magic shows up best. These are 1/144 scale, they cost between ~$15 and ~$30, and they build in two to three hours. The HG Gundam Aerial is the one I recommend to everyone, and I've bought three of them now. One for me, one for a friend's kid, one to panel-line and display.
The Aerial fits together like a dream. Every piece clicks, nothing needs glue, and the color separation is so good it genuinely looks like it came out of a showroom in Japan without a drop of paint. The articulation is ridiculous, too. The thing can basically twerk in stop-motion, which I have demonstrated to exactly zero people who asked.
The catch is the panel-lining. Without it, the kit looks flat. The plastic is a bit too uniform, and the details don't pop until you run some ink in the grooves. That's a feature, honestly. It teaches beginners the one skill that upgrades every kit they'll ever build.
The HG RX-78-2 Beyond Global is another one that surprised me. It's a reimagining of the original Gundam, and the engineering is modern even though the design is ancient. It's got a slightly different silhouette than the original, which purists hate, but the build quality is excellent. It took me about two hours, and I didn't need to sand a single nub.
If you want something with a bit more character, the HGUC Zaku II (Shin Matsunaga Custom) is a solid pick. The white and pink color scheme is striking, and the monoeye sticker is the only real pain point. You'll need tweezers. The plastic ones included are useless, as always.
One thing I will say about HG kits: they're small. The parts are tiny, and if you have big hands like mine, you will fumble. I've dropped more than a few pieces onto the carpet and spent ten minutes hunting with a flashlight. The HG Guncannon is an older kit, and it shows. The seams are visible, the articulation is dated, and it needs paint to look good. Skip it unless you're a completionist.
RG: The Grade That Will Test Your Patience
Real Grade kits are 1/144 scale like HG, but they pack in an inner frame and a part count that borders on absurd. The HG Infinite Justice Type II is a simpler kit with fewer parts and no inner frame. The result is stunning, but the process is an exercise in joint isolation.
The biggest issue with RG kits is the small parts. I'm not talking about small like HG small. I'm talking about pieces the size of a grain of rice that need to be positioned perfectly or the whole arm won't articulate. I've had to use a magnifying glass for several sections, and I've got decent eyes for a man my age.
The RG inner frames are impressive, but they're also fragile. I broke a hip joint on an older RG model by applying the kind of force that would be completely fine on an HG. The fix was super glue and a prayer, and the kit now lives in a pose that hides the damage. I still display it, but I'll never pose it again.
The HG Witch from Mercury line is a better entry point than any RG kit, and I say that as someone who loves the RG line. The RG kits are for builders who want a challenge and don't mind tiny, fiddly pieces. If that sounds like you, go for it. If you're new, start with HG.
MG: The Sweet Spot
Master Grade kits are 1/100 scale, and they're the reason my shelf is running out of space. They're bigger, more detailed, and the inner frames are genuinely impressive. The MG Ver.Ka Wing Gundam Zero EW is one of my favorites, and it's a perfect example of what the grade does well.
The build takes about six to eight hours, and the finished kit is a showpiece. The wings are massive, the articulation is solid, and the water slides are actually usable. I've heard complaints about the decals being fiddly, but I didn't have that problem. The instructions are clear, and the parts fit together without any issues.
The MGEX Strike Freedom is the extreme version of this grade, and it's a beautiful mess. The gold plating is stunning, the inner frame is incredible, and the finished build has a presence I've never seen from another kit.
But the gold scratches if you look at it wrong, and I broke a wing joint while posing it with barely any force.
I superglued it in a fixed position and now I display it slightly differently than intended. I still love it, but I'll never pose it again.
At ~$180, the MGEX is worth it for the experience. At ~$250, it's not. I don't think any model is that good. And the gold inner frame? Completely covered once the armor is attached. I spent hours on it. Hours.
PG: The Two-Week Commitment
Perfect Grade kits are 1/60 scale, and they're enormous. The PG Unicorn Gundam has been sitting in my backlog for months now, and I'm frankly terrified to start it. It's got over 1,000 parts, it takes twenty hours minimum, and it costs more than my first car.
The PG line is the pinnacle of Gunpla engineering. The inner frames are the stuff of legends, and the finished kits are genuinely display-worthy. But they're not for beginners. I've seen adults cry over broken PG parts, and I've seen the gold plating on the Phenex scratch just from handling it once.
If you're ready for a PG, you know who you are. You've built a dozen MGs, you have a dedicated workspace, and you're not going to rush the build. If that's not you, start with an HG. The Aerial is waiting.
Paints and Tools
You'll need a few things before you start. A good pair of nippers is non-negotiable. The plastic ones included in kits are useless, and you'll end up with nub marks that ruin the finish. I use a pair of GodHands, but any decent brand will do.
For paints, the Vallejo Model Color line is my go-to. The coverage is excellent, and the colors match the official Gundam palette closely. The Citadel Base Paints are also good, but they're designed for miniatures, so the consistency is a bit thicker. The AK Interactive 3rd Gen paints are newer, but I've been impressed with the finish.
The Bottom Line
Gunpla grades explained hg rg mg pg comes down to this: HG is the entry point, RG is the challenge, MG is the sweet spot, and PG is the commitment. The HG Aerial is the best first kit you can buy. The MG line is where you'll spend most of your time if you get hooked. And the PG line is for when you're ready to clear a weekend and lose yourself in a build.
The MGEX Strike Freedom is the best kit I've ever built, and the most fragile. I broke a wing, scratched the gold, and I'd still recommend it to anyone who knows what they're doing. Just don't pose the wings. for the HG Aerial if you're starting out. for the MGEX if you're ready to risk it.