Kit Review

Straight build + Stickers

* A Build Custom released in 2013 Build Booster and Build Booster Mk-II are repackaged and combined into one kit, so most of the review is the same as before — except for the application shots added at the end, so keep that in mind.

Two kits from the Build Custom series have been combined into one release.

< BUILD BOOSTER >

It's the Build Booster that came with the original Build Strike Gundam,
now with additional joint parts included.

The Build Booster is 100% identical to the one from the Build Strike.

Various joint parts for attaching to other kits.

1/144 Gunpla 18 (Build Booster Set) - Attached to the HG Strike Gundam. Compatible right out of the box with no ex

Attached to the HG Strike Gundam.
Compatible right out of the box with no extra joint parts needed.

Action pose

It can also be combined with the Aile pack using a separate joint part.

Build Booster + Aile combination

1/144 Gunpla 18 (Build Booster Set) - Using the multi-joint adapter, it's compatible with HG-scale kits that have

Using the multi-joint adapter, it's compatible with HG-scale kits that have a stand hole in the crotch area.

Attached to the HGUC Unicorn Gundam

1/144 Gunpla 18 (Build Booster Set) - You can also use the horseshoe-style joint to slot it between the waist of a

You can also use the horseshoe-style joint to slot it between the waist of an HG kit.

Attached to the HGUC Zephyranthes

1/144 Gunpla 18 (Build Booster Set) - The horseshoe-style joint comes in two sizes, so you can pick whichever fits

The horseshoe-style joint comes in two sizes,
so you can pick whichever fits the waist shape of your kit.

Attached to the HGUC Zeta Gundam

1/144 Gunpla 18 (Build Booster Set) - There's also a joint part for attaching to HGUC kits that have a backpack pe

There's also a joint part for attaching to HGUC kits that have a backpack peg hole.

Attached to the HGUC Double Zeta Gundam

There's also a joint part for kits that have two backpack peg holes.

1/144 Gunpla 18 (Build Booster Set) - Action pose attached to the HGAC Wing Gundam (1/3)

Action pose attached to the HGAC Wing Gundam

-- Additional shots --

Build Booster applied to the HGAW Gundam Double X.

< BUILD BOOSTER Mk-II >

Consists of the Build Booster Mk-II main body, a forearm joint unit, and a special joint unit.

Mounted on Action Base 2

Bottom view.

1/144 Gunpla 18 (Build Booster Set) - As shown, the left and right Beam Rifle Mk-IIs can be detached, and the cock

As shown, the left and right Beam Rifle Mk-IIs can be detached,
and the cockpit unit at the front can be removed and mounted on an MS's back.

1/144 Gunpla 18 (Build Booster Set) - The side units can be split into three pieces — the Beam Rifle Mk-II, a smal

The side units can be split into three pieces — the Beam Rifle Mk-II, a small shield, and so on.

1/144 Gunpla 18 (Build Booster Set) - Four joint parts are included for compatibility with other HG kits, but hone

Four joint parts are included for compatibility with other HG kits, but...
honestly you probably won't end up using them much.

1/144 Gunpla 18 (Build Booster Set) - The forearm joint unit is compatible with the shield mounting holes found on

The forearm joint unit is compatible with the shield mounting holes found on most Gunpla forearms.

1/144 Gunpla 18 (Build Booster Set) - Attached to the HGUC First (1/4)

1/144 Gunpla 18 (Build Booster Set) - Attached to the HGUC First (2/4)

Attached to the HGUC First

Attached to the HGUC GM

Attached to the HGUC GM Quel.
A lot of kits don't have holes in the backpack, so hanging it all the way back there is a bit tricky.

Attached to the HGUC Zeta Gundam

Attached to the HGUC GM Command Space Type

This kit is the 1/144 Option Parts Gunpla 18 (Build Booster Set). It's a Build Custom released in 2013 Build Booster and Build Booster Mk-II simply repackaged together. So most of this review is the same as before — except for the added application shots, so keep that in mind.

Both kits were originally backpack options included with separate HG Build Fighters kits, designed to be mounted on a variety of HG kits. A range of joint parts are included, so you can try them out on most standard-sized HG kits.

So there you have it — a versatile accessory kit that works with all kinds of HG kits. Even if you don't attach it to any Gunpla, it's not a bad-looking display piece on its own either. Either way, if the style appeals to you, it's a fun little option parts kit worth picking up without much hesitation. :-)

1/144 Gunpla 18 (Build Booster Set) | 2025.11 | ¥1,100

AIThis page was translated by Claude Sonnet.