HGGundam Build Divers / Gundam Build Fighters (High Grade Build Custom, HGBC line)

Binder Gun

A pocket-change box of joints and blades that turns any HG shelf into a weapons locker.

MechaGrade Score

3.7/5

Binder Gun · 1/144 · 2018

GradeHG

Scale1/144

Released2018

Runnersn/a

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The verdict

I did not expect a 648 yen accessory box to be this much fun.

The Binder Gun is not a mobile suit, it is a customization kit, and once I stopped judging it like one it clicked as one of the best value adds in the whole HGBC line. You get four binder pieces, a pistol, and a pile of joints that reconfigure into swords, rifles, and one absurd oversized cannon. For the price, I have not gotten this much mileage out of a parts set in a long time.

Best for: HG builders who already have a shelf of kits and want to arm or re-arm them without buying another full model

The full review

What it is

The Binder Gun is part of Bandai's Option Parts Set line, sold under the HGBC (High Grade Build Custom) banner that grew out of Gundam Build Fighters and carried into Gundam Build Divers. There is no mobile suit body here, just two large binder units, two small binder units, a handgun, double-sided handles, and a drawer full of ball joints and adapters. I built it expecting a quick fifteen minute distraction and ended up spending most of an hour just trying combinations. The large binders clip onto a double handle to become a single or dual blade, the small binders snap onto a single handle to become a sidearm, and every piece can be strung together into one comically long rifle. It is a toy box, and it is a genuinely good one.

The catch

This is not a kit for someone who wants a suit to display on its own, it exists to be mounted on something else, so budget for a host kit if you do not already own one with 3mm sockets. The parts are small and the joints are numerous, which means the runners take real patience to clip and there is a real risk of losing a tiny adapter to the carpet. There is no color separation to speak of and no stickers included, so the whole set comes in a limited palette and will look flat until you paint it or accept the plain plastic. Panel line detail is minimal since these are meant to be weapons, not showpieces.

Who it's for

Grab this if you already build HG kits and want a cheap way to reload a suit's arsenal or build something that never existed in the anime. It is a great low-stakes weekend project for anyone who likes fiddly small-parts assembly, and it is an easy add to an order since it barely moves the needle on price. Skip it if you are new to the hobby and want your first kit to look like the box art right out of the bag, or if you do not already own an HG body to mount it on, since on its own it is just a pile of parts with nothing to pose.

The build story

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

The runners lean heavily on tiny ball joints, pivot joints, and double and single joint connectors, so gate cleanup is fast per piece but there are a lot of pieces to get through. Nothing fought me on fit, the sockets are snug without being tight enough to strip, and the adapters that convert between joint sizes worked cleanly every time I swapped a configuration.

The engineering payoff is in the modularity, not in any single build. Combining the two large binders with the double handle gives you a proper single or dual blade with real heft, while the two small binders and the pistol grip make a stubby handgun that looks like a legitimate sidearm rather than an afterthought. Chaining every binder and joint together produces one oversized rifle that is more novelty than practical loadout, but it is a fun payoff for 648 yen worth of plastic.

Lore & trivia

01The Binder Gun released in July 2018 for 648 yen (roughly six US dollars) as part of Bandai's HGBC, High Grade Build Custom, line tied to the Gundam Build Divers anime.
02It is also catalogued under Bandai's separate Option Parts Set numbering as Option Parts Set Gunpla 17, showing how the same weapon sets crossed over between the Build Fighters and Build Divers option parts branding.
03The design draws visual inspiration from existing in-universe railgun weapons, most notably Atlas Gundam's railgun and the Drei Zwerg twin cannon carried by Wing Gundam Zero Custom.
04The kit's connector parts use the same 3mm peg standard found across most HG lines, which is why it was marketed as compatible with a wide range of Gundam Build Divers and general HG kits rather than tied to one specific mobile suit.