HGUniversal Century

XM-X2ex Crossbone Gundam X2 Kai

The Crossbone X2 with a bigger X on its back and a darker story behind the pilot seat.

MechaGrade Score

3.8/5

Crossbone Gundam X2 Kai · 1/144 · 2015

GradeHG

Scale1/144

Released2015

Runnersn/a

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The verdict

This is the HGUC Crossbone line at its most confident, and the Jupiter Empire retool gives it a real reason to exist beyond a simple recolor.

I like it more than I expected to. The new head, enlarged back thrusters, and that absurd 150mm Buster Launcher make it read as a distinct machine on the shelf, not just an X2 with a paint job, and the kit backs that up with the same solid HGUC engineering the Crossbone line built its reputation on.

Best for: Crossbone Gundam fans and HGUC collectors who want the Jupiter Empire retool of the X2, not just another X1 recolor

The full review

What it is

The X2 Kai is what happens when the Jupiter Empire gets its hands on a Crossbone Gundam X2 that lost its Core Fighter in battle and has to make it whole again with their own tech. Bandai leaned into that story with genuinely new tooling rather than reusing the X1 shell wholesale: a reshaped head and blade antenna, visibly larger back thrusters, and a new dedicated Buster Launcher that runs about 150mm long fully assembled. Building it feels like building a proper Crossbone kit, snap-fit HGUC engineering, molded color doing the heavy lifting instead of stickers, and a fistful of palm parts so every weapon actually has a hand built for it.

The catch

This was a Premium Bandai exclusive, so it never had a mainline retail run, meaning pricing and availability run higher and spottier than a standard HGUC release, expect to hunt secondary market listings rather than a shelf pull. The back thrusters, the kit's signature new feature, have a reported tendency toward loose free rotation rather than holding a firm pose, which undercuts the drama of the redesign a little. And because this shares its core engineering with the rest of the 2015 Crossbone HGUC wave, you're getting the articulation ceiling of a mid-2010s HG, good, but a step below what RG or MG frames in the same era were already doing.

Who it's for

If you already have or love the HGUC Crossbone X1 and want the darker, retooled counterpart with its own silhouette and an oversized cannon to match, this is worth tracking down. It also works well for anyone who wants a single dramatic HG display piece built around one accessory, the Buster Launcher genuinely anchors a pose. Skip it if you only want the classic X2 and don't care about the Jupiter Empire redesign, or if P-Bandai exclusivity pricing is a dealbreaker, since the standard X1 and X2 releases get you most of the same build experience for less hassle.

The build story

What the build is actually like, and the engineering worth knowing about.

This shares its core frame and gate layout with the rest of Bandai's 2015 HGUC Crossbone wave, so assembly follows the same pattern: mostly snap-fit, minimal glue needed, with a manageable nub count for a mid-complexity HG. The palm parts deserve a mention, there are enough of them molded specifically to hold each weapon properly, which is a small thing that a lot of kits skip and it pays off the moment you start posing the finished figure with its loadout.

The standout engineering is the retooled upper body: the reshaped head and larger back thrusters aren't just cosmetic add-ons, they're new molds built to sell the Jupiter Empire modification story, and up close the added bulk on the thrusters genuinely changes the suit's silhouette from the standard X2. Weapon loadout is generous for an HG, the dedicated Buster Launcher plus the usual Crossbone toolkit of scissor anchors, heat daggers, beam sabers, and a beam shield, and color separation on the Vanguard scheme is handled through molded plastic rather than stickers, which is exactly what you want from a display-focused kit at this price point.

Lore & trivia

01The Kai variant exists because the original XM-X2 lost its detachable Core Fighter in combat, forcing a full cockpit redesign when the Jupiter Empire rebuilt it.
02Its pilot, Zabine Chareux, defected to the Jupiter Empire after his aristocratic worldview clashed with the Crossbone Vanguard, and was ritualistically tortured en route to prove his loyalty before being given this suit.
03The suit meets its end in a duel with Kincade Nau (Seabook Arno), who finishes the fight by driving a heat dagger through the X2 Kai's cockpit.
04The kit was released in June 2015 as a Premium Bandai exclusive at 2,160 yen, never getting a standard retail HGUC release.